The Journey of Proteins

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Questions and Answers

Which process involves the shaping of a protein after the translation process?

  • Post translational modification (correct)
  • Protein folding
  • Protein sorting
  • Protein degradation

What is the primary sequence of a protein?

  • The degradation process of the protein
  • The folded and formed protein
  • The sequence of amino acids glued together (correct)
  • The final destination of the protein

What is required for a protein to be functional?

  • A stretch of amino acids
  • Protein sorting
  • Protein degradation
  • Protein folding (correct)

What is the main focus of protein sorting?

<p>Directing proteins to their final destination (C)</p> Signup and view all the answers

What happens to a protein after it has done its job?

<p>Protein degradation (B)</p> Signup and view all the answers

What is the term used to describe the formation of a protein with a tertiary structure?

<p>Protein folding (B)</p> Signup and view all the answers

What are the two ways of forming a protein before reaching the tertiary structure?

<p>Plated sheet and alpha helix (D)</p> Signup and view all the answers

What is the main focus of post translational modification?

<p>Protein sorting (B)</p> Signup and view all the answers

What is the term used to describe the death of a protein?

<p>Protein degradation (D)</p> Signup and view all the answers

What is the delicate and complex process involved in directing proteins to their final destination?

<p>Protein sorting (D)</p> Signup and view all the answers

Which of the following is NOT a type of secondary structure in proteins?

<p>Quaternary structure (D)</p> Signup and view all the answers

Which type of protein is most likely to have plated sheets as a secondary structure?

<p>Structural proteins (C)</p> Signup and view all the answers

What is the primary structure of a protein?

<p>A stretch of amino acids (D)</p> Signup and view all the answers

How many different proteins can be made with 20 amino acids?

<p>10^78 (A)</p> Signup and view all the answers

If a protein consists of 60 amino acids, how many different proteins can be made?

<p>10^78 (D)</p> Signup and view all the answers

What is the quaternary structure of a protein?

<p>A combination of several tertiary structures (D)</p> Signup and view all the answers

What is the mathematical formula to calculate the number of possible peptides from a chain with N amino acids?

<p>N^20 (B)</p> Signup and view all the answers

How many different tripeptides can be made with 3 amino acids?

<p>8,000 (B)</p> Signup and view all the answers

Which of the following is NOT a type of protein secondary structure?

<p>Tertiary structure (B)</p> Signup and view all the answers

What is the purpose of the random coil in a protein?

<p>To denote parts of the protein that are not yet understood (D)</p> Signup and view all the answers

Which amino acid contains a sulfur group?

<p>Cysteine (B)</p> Signup and view all the answers

What type of bonds are formed between cysteines in a protein?

<p>Covalent bonds (C)</p> Signup and view all the answers

Which type of bridges can be formed between polar groups in a protein?

<p>Hydrogen bridges (A)</p> Signup and view all the answers

What type of bridges can be formed between ionized groups in a protein?

<p>Salt bridges (D)</p> Signup and view all the answers

What type of interactions involve polar and non-polar side chains in a protein?

<p>Hydrophobic interactions (B)</p> Signup and view all the answers

Which type of interactions are especially involved in hydrophobic interactions?

<p>Non-polar side chains (A)</p> Signup and view all the answers

What type of interactions are involved in the folding of a protein?

<p>Hydrophobic interactions (B)</p> Signup and view all the answers

What type of bridges can be formed between side chains with a similar charge in a protein?

<p>Metal bridges (B)</p> Signup and view all the answers

Which element plays a very important role in protein folding?

<p>Magnesium (A)</p> Signup and view all the answers

What is the term used to describe the formation of a protein with a tertiary structure?

<p>Folding (C)</p> Signup and view all the answers

Which country is mentioned as being warm compared to Dutch standards in the text?

<p>Spain (A)</p> Signup and view all the answers

According to the text, what happens to your body after half a year of living in Helsinki?

<p>It becomes more resistant to cold temperatures (D)</p> Signup and view all the answers

What allows us to accommodate two different environments, such as different temperatures, according to the text?

<p>Proteins (B)</p> Signup and view all the answers

What is the term used to describe the total of secondary structure elements folded specifically to a compact form, which is a protein?

<p>TATCH-HER structure (A)</p> Signup and view all the answers

Which of the following is NOT a type of secondary structure in proteins?

<p>TATCH-HER structure (D)</p> Signup and view all the answers

What are the two types of secondary structure mentioned in the text?

<p>Alpha helix and beta-plated sheet (B)</p> Signup and view all the answers

According to the text, why do we have an enormous possibility to make a huge amount of proteins?

<p>Because we can generate certain proteins (A)</p> Signup and view all the answers

What is the primary focus of the TATCH-HER structure, according to the text?

<p>Protein folding (D)</p> Signup and view all the answers

What is the purpose of the random coil in a protein, according to the text?

<p>To increase protein diversity (C)</p> Signup and view all the answers

What is the term used to describe the shaping of a protein after the translation process?

<p>Post-translational modification (D)</p> Signup and view all the answers

What is the role of proteolysis in post-translational modifications?

<p>To remove unnecessary amino acids from proteins (A)</p> Signup and view all the answers

What is the purpose of removing the first amino acid (methionine) from a protein?

<p>To make the protein fully functional (B)</p> Signup and view all the answers

What is the function of dysulfide bridges in post-translational modifications?

<p>To modify the structure of proteins (C)</p> Signup and view all the answers

What is the purpose of hydroxylation in post-translational modifications?

<p>To modify the structure of proteins (B)</p> Signup and view all the answers

What is the role of chaperones in protein folding?

<p>To assist in the formation and folding of proteins (C)</p> Signup and view all the answers

What happens to misfolded proteins that cannot be correctly folded?

<p>They are degraded by the proteasome (B)</p> Signup and view all the answers

What is the consequence of protein misfolding and accumulation?

<p>Formation of amyloid fibrils (A)</p> Signup and view all the answers

What is the primary role of the proteasome in protein degradation?

<p>To degrade misfolded proteins (B)</p> Signup and view all the answers

What is the process called when misfolded proteins escape normal degradation and start to accumulate?

<p>Protein aggregation (A)</p> Signup and view all the answers

Which of the following is NOT a role of chaperones in protein folding?

<p>Transportation to the Golgi apparatus (A)</p> Signup and view all the answers

Which organelle primarily facilitates protein folding?

<p>Endoplasmic reticulum (A)</p> Signup and view all the answers

What is the role of molecular chaperones in protein folding?

<p>They help in folding proteins (A)</p> Signup and view all the answers

Where does glycosylation primarily take place?

<p>Endoplasmic reticulum (A)</p> Signup and view all the answers

What are phosphorylation and dephosphorylation processes involved in?

<p>Post-translational modifications (C)</p> Signup and view all the answers

What is the role of phospholation and defosolation in the body?

<p>They are involved in various physiological processes (A)</p> Signup and view all the answers

What is the name of the protein class that helps in folding proteins?

<p>Chaperones (C)</p> Signup and view all the answers

What is the main focus of post-translational modifications?

<p>Further shaping proteins (C)</p> Signup and view all the answers

Where does protein folding primarily take place?

<p>Endoplasmic reticulum (C)</p> Signup and view all the answers

What is the name of the process that involves the addition of sugar molecules to proteins?

<p>Glycosylation (B)</p> Signup and view all the answers

What is the role of the Golgi apparatus in protein modification?

<p>Further modification of glycosylated proteins (D)</p> Signup and view all the answers

Which of the following is true about protein glycosylation?

<p>It is important for stability of proteins in the plasma membrane (A)</p> Signup and view all the answers

What is the role of protein kinases?

<p>To add a phosphate group to a protein (A)</p> Signup and view all the answers

What is the significance of protein phosphorylation in cell signaling?

<p>It activates proteins involved in glucose transport (C)</p> Signup and view all the answers

What is the function of protein phosphatases?

<p>To remove a phosphate group from a protein (A)</p> Signup and view all the answers

Which amino acids can be phosphorylated in proteins?

<p>Serine, threonine, and tyrosine (C)</p> Signup and view all the answers

What is the relationship between protein phosphorylation and protein activity?

<p>Phosphorylation can both activate and deactivate proteins (B)</p> Signup and view all the answers

What is the role of insulin in glucose transport?

<p>It stimulates the insertion of glucose transporters into the plasma membrane (B)</p> Signup and view all the answers

What is the name of the enzyme that removes phosphate groups from proteins?

<p>Protein phosphatase (A)</p> Signup and view all the answers

What is the significance of protein phosphorylation in cell cycling processes?

<p>It plays a role in activating and deactivating proteins involved in cell cycling (A)</p> Signup and view all the answers

What is the function of glycosylated proteins in viral infections?

<p>To hide viral proteins from immune recognition (A)</p> Signup and view all the answers

Which of the following is a reason why scientists are concerned about the onset of Alzheimer's disease occurring at an earlier age?

<p>Misfolded proteins are accumulating in the brain (A)</p> Signup and view all the answers

What is the purpose of glycosylation of proteins?

<p>To add stability to proteins (B)</p> Signup and view all the answers

Which of the following sugars is NOT mentioned as part of the complex sugar trees found in glycoproteins?

<p>Anacetylneuromininic acid (B)</p> Signup and view all the answers

Why do glycoproteins have complex sugar trees?

<p>To increase protein stability (A)</p> Signup and view all the answers

What is the age range of people who used to primarily develop Alzheimer's disease?

<p>60-70 years old (C)</p> Signup and view all the answers

What is the term used to describe the process of adding a sugar tree on top of a protein?

<p>Glycosylation (A)</p> Signup and view all the answers

What is the consequence of the accumulation of misfolded proteins in the body?

<p>Protein misfolding diseases like Alzheimer's (C)</p> Signup and view all the answers

What is the primary focus of scientists studying the onset of Alzheimer's disease at an earlier age?

<p>Identifying the cause of the earlier onset (D)</p> Signup and view all the answers

What is the name of the sugar mentioned in the text that is part of the complex sugar trees found in glycoproteins?

<p>Mannose (D)</p> Signup and view all the answers

Why are scientists concerned about the accumulation of misfolded proteins in society?

<p>It is leading to an earlier onset of Alzheimer's disease (D)</p> Signup and view all the answers

Which process is heavily dependent on correct phosphorylation and dephosphorylation of certain proteins in the signaling pathway?

<p>Proteolysis (D)</p> Signup and view all the answers

What is the first step to activate insulin?

<p>Proteolysis (D)</p> Signup and view all the answers

Which amino acid is usually hydroxylated in proteins?

<p>Proline (D)</p> Signup and view all the answers

What is the function of insulin?

<p>To regulate glucose transport (D)</p> Signup and view all the answers

Which post-translational modification is connected to the stability of protein integrity?

<p>Hydroxylation (B)</p> Signup and view all the answers

What is the inactive form of insulin maintained by?

<p>Formation of disulfide bridges (D)</p> Signup and view all the answers

What is the main focus of post-translational modifications?

<p>To modify proteins after translation (B)</p> Signup and view all the answers

What is the role of the pancreas in insulin secretion?

<p>To secrete insulin (B)</p> Signup and view all the answers

Which type of protein structure is most likely to have plated sheets?

<p>Secondary structure (C)</p> Signup and view all the answers

What is the irreversible reduction of insulin necessary for?

<p>To make active insulin (C)</p> Signup and view all the answers

Which compound is necessary for the conversion of iron two plus to iron three plus in the reaction described in the text?

<p>Vitamin C (D)</p> Signup and view all the answers

What is the role of collagen in the body?

<p>To provide stability to the skin (D)</p> Signup and view all the answers

What happens if the process of collagen cross-linking is derailed?

<p>Loose collagen fibers form (B)</p> Signup and view all the answers

What is the consequence of a shortage of vitamin C in the body?

<p>Hydroxyproline cannot be rehydroxylized (A)</p> Signup and view all the answers

What is the appearance of the skin in scurvy?

<p>Bleeding and loose (A)</p> Signup and view all the answers

What is the primary function of hydroxyproline in collagen?

<p>To hydroxylize proline (A)</p> Signup and view all the answers

What is the role of vitamin C in collagen synthesis?

<p>To hydroxylize proline (B)</p> Signup and view all the answers

What can be observed in electron microscope images of collagen fibers with proper cross-linking?

<p>Strong connections between collagen proteins (B)</p> Signup and view all the answers

What is the main cause of scurvy?

<p>A shortage of vitamin C (B)</p> Signup and view all the answers

What is the consequence of loose collagen fibers in the skin?

<p>Red color and weak structure (C)</p> Signup and view all the answers

Which transport route is used to transport proteins from the cytosol to the nucleus?

<p>Gated transport (B)</p> Signup and view all the answers

Which transport route is used to transport proteins from the cytosol to peroxisomes?

<p>Transmembrane transport (D)</p> Signup and view all the answers

Which transport route is used to transport proteins from the cytosol to mitochondria?

<p>Transmembrane transport (B)</p> Signup and view all the answers

Which transport route is used to transport proteins from the cytosol to the endoplasmic reticulum?

<p>Transmembrane transport (D)</p> Signup and view all the answers

Which transport route is used to transport proteins from the Golgi to the cell exterior?

<p>Vesicular transport (B)</p> Signup and view all the answers

Which transport route is used to transport proteins from the cell exterior to early endosomes?

<p>Vesicular transport (A)</p> Signup and view all the answers

Which transport route is used to transport proteins from early endosomes to late endosomes?

<p>Vesicular transport (D)</p> Signup and view all the answers

Which transport route is used to transport proteins from late endosomes to lysosomes?

<p>Vesicular transport (B)</p> Signup and view all the answers

Which transport route is used to transport proteins from the Golgi to secretory vesicles?

<p>Vesicular transport (A)</p> Signup and view all the answers

Which transport route is used to transport proteins from the Golgi to the cell exterior without regulation?

<p>Constitutive pathway (D)</p> Signup and view all the answers

Which organelle does a protein need to be imported into if it contains a sequence of amino acids with lysine, lysine, lysine, arginine, lysine in the primary sequence?

<p>Mitochondria (A)</p> Signup and view all the answers

What is the role of chaperone proteins in protein transport?

<p>They transport the protein to its final destination (B)</p> Signup and view all the answers

What is the main purpose of post-translational modifications?

<p>To direct the protein to its final destination (C)</p> Signup and view all the answers

Which of the following sequences of amino acids is a signal for protein transport to the nucleus?

<p>Proline, proline, lysine, arginine, lysine (C)</p> Signup and view all the answers

Where does protein phospholation usually take place?

<p>Cytosol (B)</p> Signup and view all the answers

What is the function of the primary sequence in proteins?

<p>To determine the protein's final destination (B)</p> Signup and view all the answers

Which of the following is NOT a possible destination for a protein within a cell?

<p>Plasma membrane (B)</p> Signup and view all the answers

What is the role of lysine and arginine in protein transport?

<p>To act as signals for protein transport (C)</p> Signup and view all the answers

Which of the following is NOT mentioned as a possible destination for a protein within a cell?

<p>Cytosol (C)</p> Signup and view all the answers

What is the purpose of the post-translational process in protein transport?

<p>To determine the protein's final destination (D)</p> Signup and view all the answers

What is the purpose of the ton complex in the mitochondria?

<p>To transport proteins from the cytosol to the mitochondria (B)</p> Signup and view all the answers

What is the role of the TIM complex in the mitochondria?

<p>To insert the protein into the inner membrane (A)</p> Signup and view all the answers

What happens to the signal peptide of a protein after it reaches its destination in the mitochondria?

<p>It is cleaved off (C)</p> Signup and view all the answers

What is the main function of the nuclear import receptor?

<p>To recognize the nuclear import signal (A)</p> Signup and view all the answers

What is the purpose of RON GDP in the nuclear import and export process?

<p>To bind to the nuclear import receptor (D)</p> Signup and view all the answers

Which organelle contains two membranes?

<p>Mitochondria (B)</p> Signup and view all the answers

Which structure is responsible for the transport of molecules between the cytosol and the nucleus?

<p>Nuclear pore complex (D)</p> Signup and view all the answers

What is the role of the tom complex in the mitochondria?

<p>To transport proteins from the cytosol to the mitochondria (B)</p> Signup and view all the answers

What type of transport is used for larger molecules to pass through the nuclear pore complex?

<p>Active transport (C)</p> Signup and view all the answers

What is the role of HP70 in protein import in the mitochondria?

<p>To hydrolyze ATP for protein import (D)</p> Signup and view all the answers

What is the role of nuclear import receptors in the transport of proteins into the nucleus?

<p>To recognize and transport proteins with a nuclear localization signal (A)</p> Signup and view all the answers

What is the primary function of the nuclear import receptors?

<p>To transport proteins into the nucleus (C)</p> Signup and view all the answers

What is the function of the nuclear export receptor?

<p>To transport proteins from the nucleus to the cytosol (B)</p> Signup and view all the answers

What is the main characteristic of molecules that can pass through the nuclear pore complex via free diffusion?

<p>Small size (C)</p> Signup and view all the answers

What is the purpose of hydrolyzing RON GDP to RON GDP in the nuclear import and export process?

<p>To release the cargo from the nuclear export receptor (A)</p> Signup and view all the answers

What is the composition of the cytosol compared to the nucleus?

<p>Similar salts and pH (C)</p> Signup and view all the answers

What is the term used to describe the transport between equal compartments with similar conditions?

<p>Equilibrium transport (C)</p> Signup and view all the answers

What is the purpose of the double layer of membranes in the nucleus?

<p>To protect the genetic material (C)</p> Signup and view all the answers

What is the term used to describe the proteins that make up the nuclear pore complex?

<p>Nuclear pore proteins (A)</p> Signup and view all the answers

What is the function of the nuclear pore complex?

<p>To transport molecules between the cytosol and nucleus (B)</p> Signup and view all the answers

What is the main function of the endoplasmic reticulum in a cell?

<p>Synthesizing proteins within the cytosol (D)</p> Signup and view all the answers

What type of cell is specifically designed for exocrine function?

<p>Pancreatic beta cell (D)</p> Signup and view all the answers

What is the majority composition of the cytosol in an exocrine cell?

<p>Endoplasmic reticulum (D)</p> Signup and view all the answers

What is the role of the signal sequence in protein import into the endoplasmic reticulum?

<p>Telling the ribosome to go to the ER (A)</p> Signup and view all the answers

When is the signal peptide no longer necessary for protein import into the ER?

<p>When the protein is fully translated (C)</p> Signup and view all the answers

What is the main function of the ER network in a cell?

<p>Synthesizing proteins within the cytosol (A)</p> Signup and view all the answers

What determines the amount of ER present in a cell?

<p>The function of the cell (D)</p> Signup and view all the answers

What is the main focus of protein import in the ER?

<p>Synthesizing proteins within the cytosol (C)</p> Signup and view all the answers

What happens to the signal peptide after protein translation?

<p>It is degraded (A)</p> Signup and view all the answers

What is the significance of exocrine cells in protein secretion?

<p>They are specialized for secreting specific proteins (A)</p> Signup and view all the answers

Which molecule recognizes the signal peptide and connects to the ribosomal complex?

<p>Signal recognition particle (D)</p> Signup and view all the answers

What happens to the translation process when the SRP connects to the ribosomal complex?

<p>The translation process is paused (B)</p> Signup and view all the answers

What is the role of the SRP receptor in the protein translocation process?

<p>It recognizes the signal recognition particle (A)</p> Signup and view all the answers

Where is the protein translocator located in relation to the SRP receptor?

<p>Close to the SRP receptor (D)</p> Signup and view all the answers

What happens to the connection between the SRP receptor and the ribosomal complex when the protein translocation process begins?

<p>The connection is loosened (A)</p> Signup and view all the answers

What holds the signal peptide on the translocator during the translation process?

<p>Protein translocator (B)</p> Signup and view all the answers

What directs the ribosome complex with the proteins that should be inside the ER?

<p>Signal recognition particle (A)</p> Signup and view all the answers

What happens to the ribosome complex after the translation process is completed?

<p>It is liberated and can go back to the pool of ribosome subunits (B)</p> Signup and view all the answers

What determines whether a ribosome is free or bound to the ER?

<p>The presence of a signal sequence (B)</p> Signup and view all the answers

What is the main reason for having free and ER-bound ribosomes in the cell?

<p>Different proteins are synthesized by free and ER-bound ribosomes (D)</p> Signup and view all the answers

Which type of ribosomes are shown in the picture?

<p>Polyribosomes (A)</p> Signup and view all the answers

What is the function of the translocator in protein synthesis?

<p>To recognize the signaling sequence (C)</p> Signup and view all the answers

What is the role of signal peptidase in protein synthesis?

<p>To disconnect the signal sequence (B)</p> Signup and view all the answers

Where are transmembrane proteins inserted?

<p>ER membrane (C)</p> Signup and view all the answers

What is the main difference between secretory proteins and transmembrane proteins?

<p>Secretory proteins are freely floating in the ER lumen, while transmembrane proteins are inserted into the ER membrane (D)</p> Signup and view all the answers

What is the consequence of a shortage of vitamin C in the body?

<p>Loss of collagen fibers (B)</p> Signup and view all the answers

What is the function of molecular chaperones in protein folding?

<p>To facilitate protein folding (B)</p> Signup and view all the answers

What is the primary role of the ER network in a cell?

<p>Protein synthesis (B)</p> Signup and view all the answers

What is the term used to describe the process of protein transport to the plasma membrane?

<p>Exocytosis (A)</p> Signup and view all the answers

What is the role of the TIM complex in the mitochondria?

<p>To insert proteins into the mitochondrial membrane (A)</p> Signup and view all the answers

During protein translocation, the presence of a stop-transfer sequence leads to

<p>Halting of the translocation process (A)</p> Signup and view all the answers

What is the role of the translocator in protein translocation?

<p>To notify the presence of a signal peptide (D)</p> Signup and view all the answers

What happens when a protein encounters a start domain during translocation?

<p>It continues to be synthesized on the inside of the membrane (D)</p> Signup and view all the answers

Which organelle is responsible for sorting proteins in the trans-Golgi network?

<p>Early endosomes (B)</p> Signup and view all the answers

Which transport pathway is constitutively active and does not require regulation?

<p>Secretory vesicles (C)</p> Signup and view all the answers

What is the function of early endosomes in protein transport?

<p>To feed proteins to late endosomes (D)</p> Signup and view all the answers

What is the main function of the vesicular transport system?

<p>To transport proteins from the ER to the cell exterior (C)</p> Signup and view all the answers

What is the significance of the hydrophobic interaction in proteins?

<p>It helps in the synthesis of transmembrane proteins (B)</p> Signup and view all the answers

What happens to the translocation process when the ribosome continues translation after encountering a stop-transfer sequence?

<p>The protein is not properly inserted into the membrane (C)</p> Signup and view all the answers

What is the role of the stop-transfer sequence in protein translocation?

<p>To halt the translocation process (A)</p> Signup and view all the answers

Which proteins are primarily seen on the surface of vesicles involved in vesicular transport?

<p>Clathrin, COP1, and COP2 (B)</p> Signup and view all the answers

During the budding phase of vesicular transport, what is contained inside the vesicles?

<p>Cargo proteins (B)</p> Signup and view all the answers

What is the role of clathrin proteins in the budding process of endocytosis?

<p>They connect to receptor proteins and help pull a part of the membrane containing the receptors and substrate (A)</p> Signup and view all the answers

What are the three stages of vesicular transport?

<p>Budding, transport, fusion (D)</p> Signup and view all the answers

What determines the destination of a vesicle during the transport phase of vesicular transport?

<p>Information carried by the vesicle (D)</p> Signup and view all the answers

What happens during the fusion process of vesicular transport?

<p>The vesicle merges with its target membrane (B)</p> Signup and view all the answers

What is the role of COP1 proteins in vesicular transport?

<p>They are primarily seen on the surface of vesicles involved in backward transport from Golgi to ER (C)</p> Signup and view all the answers

What types of proteins are primarily seen on the ER?

<p>COP2 proteins (D)</p> Signup and view all the answers

What is the purpose of clathrin-coated vesicles in endocytosis?

<p>To transport receptor proteins and their substrates into the cell (C)</p> Signup and view all the answers

What is the main function of COP2 proteins in vesicular transport?

<p>To transport proteins from the ER to the Golgi (A)</p> Signup and view all the answers

Which organelle is responsible for transporting proteins from the Golgi to late endosomes or lysosomes?

<p>Lysosomes (D)</p> Signup and view all the answers

What is the function of transferrin receptors in the cell?

<p>To transport iron into the cell (B)</p> Signup and view all the answers

Why is there transport from the Golgi to the ER?

<p>To modify proteins in the Golgi before sending them back to the ER (C)</p> Signup and view all the answers

What are the three types of physical transport mentioned in the text?

<p>Endocytosis, exocytosis, and vesicular transport (D)</p> Signup and view all the answers

Where do you primarily find clathrin-coated vesicles in the cell?

<p>Endosomes (C)</p> Signup and view all the answers

What is the main reason for sending proteins back to the Golgi for another round of folding or modification?

<p>To control protein folding and modification in the Golgi (A)</p> Signup and view all the answers

What is the function of class I main vesicles?

<p>To transport particles from outside into the cell (C)</p> Signup and view all the answers

What is the role of the Golgi in protein control?

<p>To control protein folding and modification (B)</p> Signup and view all the answers

What is the significance of iron release in the cell?

<p>To make iron available for cellular processes (C)</p> Signup and view all the answers

What is the purpose of recycling back to the plasma membrane?

<p>To recycle proteins back to the plasma membrane (B)</p> Signup and view all the answers

Which molecule is involved in determining the destination of transport vesicles in a cell?

<p>Phosphatidinosital phosphates (B)</p> Signup and view all the answers

What can be added to phosphatidil to create different varieties of phosphatidinosital phosphates?

<p>Sugar groups (B)</p> Signup and view all the answers

Which component of phosphatidinosital phosphates is responsible for their distinctiveness?

<p>Phosphates (A)</p> Signup and view all the answers

What is the main function of phosphatidinosital phosphates in protein transport?

<p>To determine the direction of transport vesicles (A)</p> Signup and view all the answers

What is the composition of membranes involved in phagocytosis, endocytosis, and exocytosis analyzed for?

<p>Phosphatidinosital phosphate content (C)</p> Signup and view all the answers

What is the name of the molecule that can have different types of phosphates attached to it?

<p>Phosphatidil (D)</p> Signup and view all the answers

What is the specific content analyzed in certain types of physicals?

<p>Phosphatidinosital phosphate content (A)</p> Signup and view all the answers

What is the role of clathrin in the transport vesicle budding process?

<p>To release clathrin (A)</p> Signup and view all the answers

What is the role of proteins in determining the destination of transport vesicles?

<p>To determine the direction of transport vesicles (B)</p> Signup and view all the answers

What is the role of sugar groups in determining the destination of transport vesicles?

<p>To modify sugar groups (A)</p> Signup and view all the answers

Which protein is responsible for recognizing specific rep proteins on vesicles and facilitating their fusion with target membranes?

<p>Rep effector proteins (B)</p> Signup and view all the answers

Which type of lipid is predominantly found in vesicles involved in regulated exocytosis?

<p>PI4P (C)</p> Signup and view all the answers

Which rep protein is specifically involved in transport between the endoplasmic reticulum (ER) and Golgi complex?

<p>Rep one (D)</p> Signup and view all the answers

Which protein is responsible for making a firm connection between vesicles and target membranes during fusion?

<p>T-snare proteins (D)</p> Signup and view all the answers

Which part of the Golgi apparatus is responsible for the modification of sugars and removal of mannose and glupinac?

<p>Medieval part (C)</p> Signup and view all the answers

Which lipid is predominantly found in vesicles involved in phagocytosis?

<p>PI3P (D)</p> Signup and view all the answers

Which protein is involved in the transport of vesicles to early endosomes?

<p>Rep five C (D)</p> Signup and view all the answers

Which lipid is predominantly found in vesicles involved in the start of phagocytosis?

<p>PI2P (C)</p> Signup and view all the answers

Which protein is responsible for recognizing specific rep proteins on vesicles and facilitating their fusion with target membranes?

<p>Rep effector proteins (B)</p> Signup and view all the answers

Which protein is involved in the transport of vesicles to late endosomes?

<p>Rep seven (A)</p> Signup and view all the answers

Which of the following is NOT a major function of proteins in our cells?

<p>Lipids (A)</p> Signup and view all the answers

What is the main function of transport proteins in our cells?

<p>Transporting proteins (A)</p> Signup and view all the answers

Which of the following is an example of a protein involved in muscle movement?

<p>Hemoglobin (A)</p> Signup and view all the answers

What is the main function of hormones in our body?

<p>Regulating gene expression (D)</p> Signup and view all the answers

What is the function of antibodies in our body?

<p>Protecting against pathogens (B)</p> Signup and view all the answers

Which of the following is an example of a protein involved in nutrient absorption?

<p>Ferritin (B)</p> Signup and view all the answers

What is the main function of receptors in our cells?

<p>Binding to signaling molecules (C)</p> Signup and view all the answers

What is the main function of proteins involved in signal transduction?

<p>Regulating gene expression (D)</p> Signup and view all the answers

What happens to a protein after it has completed its function?

<p>It is degraded (A)</p> Signup and view all the answers

What is the name of the enzyme that removes phosphate groups from proteins?

<p>Phosphatase (A)</p> Signup and view all the answers

Which type of secretory pathway is unregulated and does not require rep proteins or t-snares?

<p>Constitutive secretory pathway (B)</p> Signup and view all the answers

What is the name of the secretory pathway that requires coated vesicles, rep proteins, and t-snares?

<p>Regulated secretory pathway (B)</p> Signup and view all the answers

Which structure is responsible for the fast release of proteins in the regulated secretory pathway?

<p>Rep-Effector protein (C)</p> Signup and view all the answers

Where can one find literature regarding protein transport inside the cell?

<p>In PubMed (C)</p> Signup and view all the answers

Which lipid is predominantly found in vesicles involved in phagocytosis?

<p>Sphingolipids (A)</p> Signup and view all the answers

Which transport route is used to transport proteins from the Golgi to secretory vesicles?

<p>Coated vesicle pathway (D)</p> Signup and view all the answers

What is the name of the protein class that helps in folding proteins?

<p>Chaperones (C)</p> Signup and view all the answers

What is the consequence of a shortage of vitamin C in the body?

<p>Impaired wound healing (C)</p> Signup and view all the answers

What is the role of proteolysis in post-translational modifications?

<p>Proteolysis removes signal peptides from newly synthesized proteins. (B)</p> Signup and view all the answers

What is the role of protein kinases?

<p>Protein kinases add phosphate groups to proteins. (B)</p> Signup and view all the answers

Which of the following is a function of chaperone proteins in protein folding?

<p>To assist in correct protein folding (D)</p> Signup and view all the answers

What happens to misfolded proteins that cannot be corrected by chaperones?

<p>They are degraded by the proteasome (B)</p> Signup and view all the answers

What is the role of ubiquitin in protein degradation?

<p>To attach to misfolded proteins (C)</p> Signup and view all the answers

How is the degradation signal recognized in a misfolded protein?

<p>By the protein being deformed (D)</p> Signup and view all the answers

What is the role of a ubiquitin ligase in protein degradation?

<p>To recognize the degradation signal (D)</p> Signup and view all the answers

What is the consequence of protein aggregation in the cell?

<p>Cellular dysfunction (C)</p> Signup and view all the answers

How are newly synthesized proteins folded correctly without assistance?

<p>By spontaneous folding (A)</p> Signup and view all the answers

What is the role of the proteasome in protein degradation?

<p>To degrade misfolded proteins (A)</p> Signup and view all the answers

What is the function of ubiquitin in protein degradation?

<p>To degrade misfolded proteins (C)</p> Signup and view all the answers

What happens to proteins that are correctly folded without assistance?

<p>They can perform their function (D)</p> Signup and view all the answers

What is the function of the proteasome in protein degradation?

<p>To degrade ubiquitinated proteins (B)</p> Signup and view all the answers

What is the role of E1 enzymes in the ubiquitination process?

<p>To add more ubiquitins to the first one (A)</p> Signup and view all the answers

What is the main function of the E2 enzyme in protein ubiquitination?

<p>To add ubiquitin to proteins (D)</p> Signup and view all the answers

What is the role of E3 ligases in the ubiquitination process?

<p>To add more ubiquitins to the first one (A)</p> Signup and view all the answers

What happens to ubiquitin molecules after they are snapped off from proteins in the proteasome?

<p>They are reused in the ubiquitination process (D)</p> Signup and view all the answers

Where does protein degradation primarily take place in the cell?

<p>In the proteasome (C)</p> Signup and view all the answers

What is the main function of the proteases in the proteasome?

<p>To degrade ubiquitinated proteins (D)</p> Signup and view all the answers

Where do essential amino acids primarily come from for protein synthesis?

<p>From nutrition (A)</p> Signup and view all the answers

What is the role of the E1 enzyme in the ubiquitination process?

<p>To add more ubiquitins to the first one (B)</p> Signup and view all the answers

What does the proteasome do to proteins that are not ubiquitinated?

<p>It degrades them into smaller pieces (C)</p> Signup and view all the answers

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