Podcast
Questions and Answers
What is the main function of transport proteins present in the plasma membrane?
What is the main function of transport proteins present in the plasma membrane?
- Actively bringing things in or sending things out (correct)
- Initiating cell-to-cell adhesion
- Participating in signaling processes
- Serving as sites for specific proteins
Which macromolecule is NOT mentioned as a component of membranes in the text?
Which macromolecule is NOT mentioned as a component of membranes in the text?
- Lipids
- Nucleic Acids (correct)
- Proteins
- Carbohydrates
Where are carbohydrates typically found in relation to membranes?
Where are carbohydrates typically found in relation to membranes?
- Attached to either lipids or proteins (correct)
- Located within the nucleus
- Only in the cytoplasm of the cell
- As part of the plasma membrane structure
A phospholipid has three fatty acid tails.
A phospholipid has three fatty acid tails.
Phospholipids contain a phosphate group (which is negatively charged).
Phospholipids contain a phosphate group (which is negatively charged).
Phospholipids have a variable head group, which is polar in nature and will interact with aqueous environments.
Phospholipids have a variable head group, which is polar in nature and will interact with aqueous environments.
Phospholipids are amphipathic.
Phospholipids are amphipathic.
What is the term used for the constant spinning of a phospholipid on its axis?
What is the term used for the constant spinning of a phospholipid on its axis?
How does unsaturated fatty acids impact membrane fluidity?
How does unsaturated fatty acids impact membrane fluidity?
What is the role of cholesterol in membrane fluidity at warm temperatures?
What is the role of cholesterol in membrane fluidity at warm temperatures?
Which type of motion involves two phospholipids swapping places within the same leaflet?
Which type of motion involves two phospholipids swapping places within the same leaflet?
How do longer hydrocarbon chains in fatty acids affect membrane fluidity?
How do longer hydrocarbon chains in fatty acids affect membrane fluidity?
What is the main characteristic of phospholipids that allows them to spontaneously form a bilayer in an aqueous environment?
What is the main characteristic of phospholipids that allows them to spontaneously form a bilayer in an aqueous environment?
Which type of phosphoglyceride has a head group of choline?
Which type of phosphoglyceride has a head group of choline?
What is the major structural difference between phosphoglycerides and phosphosphingolipids?
What is the major structural difference between phosphoglycerides and phosphosphingolipids?
How many fatty acid chains do phosphosphingolipids typically have?
How many fatty acid chains do phosphosphingolipids typically have?
Who made the discovery that phospholipids form a bilayer in 1925?
Who made the discovery that phospholipids form a bilayer in 1925?
Phosphoglycerides and sphingolipids are examples of phospholipids.
Phosphoglycerides and sphingolipids are examples of phospholipids.
Which feature is true for sphingolipids?
Which feature is true for sphingolipids?
A membrane will be more rigid if it has many unsaturated fatty acids.
A membrane will be more rigid if it has many unsaturated fatty acids.
What is the defining characteristic of integral membrane proteins?
What is the defining characteristic of integral membrane proteins?
Which type of protein is usually attached to glycolipids called GPI?
Which type of protein is usually attached to glycolipids called GPI?
What is the key characteristic of lipid rafts within the membrane?
What is the key characteristic of lipid rafts within the membrane?
Oligosaccharides are only ever found attached to proteins or lipids.
Oligosaccharides are only ever found attached to proteins or lipids.
What type of bond is found between monomers in a polysaccharide?
What type of bond is found between monomers in a polysaccharide?
In membrane biology, what is the term used when sugar is attached to an asparagine amino acid residue?
In membrane biology, what is the term used when sugar is attached to an asparagine amino acid residue?
What determines blood type in red blood cell membranes?
What determines blood type in red blood cell membranes?
Which of the following is NOT a reason why proteins may not move freely in the cell membrane according to the text?
Which of the following is NOT a reason why proteins may not move freely in the cell membrane according to the text?
What type of glycosylation occurs when sugar is attached to a serine or threonine amino acid residue?
What type of glycosylation occurs when sugar is attached to a serine or threonine amino acid residue?
What was demonstrated by Larry Frye and Michael Edidin in the 1970s regarding membrane protein movement?
What was demonstrated by Larry Frye and Michael Edidin in the 1970s regarding membrane protein movement?
What is the main characteristic of epithelial cells mentioned in the text?
What is the main characteristic of epithelial cells mentioned in the text?
Which proteins are primarily responsible for attaching cells together in adherens junctions?
Which proteins are primarily responsible for attaching cells together in adherens junctions?
What is the role of cadherins in cell junctions?
What is the role of cadherins in cell junctions?
Which type of junction is specifically mentioned as being highly prominent in epithelial cells?
Which type of junction is specifically mentioned as being highly prominent in epithelial cells?
What is the function of plasmodesmata in plant cells?
What is the function of plasmodesmata in plant cells?
What is the main function of desmosomes in tissues?
What is the main function of desmosomes in tissues?
Which type of proteins make up tight junctions?
Which type of proteins make up tight junctions?
What is the main role of elastin in tissues?
What is the main role of elastin in tissues?
Which of the following is NOT a component of the extracellular matrix?
Which of the following is NOT a component of the extracellular matrix?
What is the primary role of cell walls in plant cells?
What is the primary role of cell walls in plant cells?
