Eukaryotic Cells Quiz
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Questions and Answers

Which of the following is NOT a type of organelle found within eukaryotic cells?

  • Golgi apparatus
  • Ribosomes (correct)
  • Mitochondria
  • Lysosomes
  • Which organelle is responsible for modifying, sorting, and packaging proteins and lipids?

  • Golgi apparatus (correct)
  • Lysosomes
  • Mitochondria
  • Endoplasmic reticulum
  • What is the primary function of the rough endoplasmic reticulum (ER)?

  • Lipid synthesis
  • Waste disposal
  • Protein synthesis (correct)
  • Energy production
  • Which organelle is responsible for breaking down cellular waste products and debris?

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

    Both plant and animal cells share a common set of organelles. Which of the following is NOT present in both?

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

    Which of the following are components of the cytoskeleton, which is responsible for cell shape and movement?

    <p>All of the above (D)</p> Signup and view all the answers

    What is the primary function of the nucleus?

    <p>DNA replication and storage (B)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of eukaryotes?

    <p>Presence of a cell wall (D)</p> Signup and view all the answers

    What is the primary function of the endoplasmic reticulum?

    <p>To synthesize proteins and lipids (C)</p> Signup and view all the answers

    Which of the following is NOT a component of the endomembrane system?

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

    What distinguishes rough endoplasmic reticulum from smooth endoplasmic reticulum?

    <p>Rough ER is involved in protein synthesis, while smooth ER is involved in lipid synthesis. (D)</p> Signup and view all the answers

    Which of the following is a primary role of the Golgi apparatus?

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

    How do the different components of the endomembrane system communicate?

    <p>Through direct physical connections and transfer vesicles (A)</p> Signup and view all the answers

    Which of these is a key difference between the rough endoplasmic reticulum and the smooth endoplasmic reticulum?

    <p>The rough endoplasmic reticulum is involved in protein synthesis, while the smooth endoplasmic reticulum is involved in lipid synthesis. (C)</p> Signup and view all the answers

    What is the function of the nuclear envelope in relation to the endomembrane system?

    <p>It controls the movement of molecules between the nucleus and the cytoplasm. (A)</p> Signup and view all the answers

    Which component of the endomembrane system is responsible for modifying and packaging proteins?

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

    What is the name of the internal membrane-bound compartments in chloroplasts that are arranged in stacks called grana?

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

    What is the primary difference between the inner membrane space of mitochondria and the stroma of chloroplasts?

    <p>The inner membrane space of mitochondria is involved in cellular respiration, while the stroma of chloroplasts is involved in photosynthesis. (A)</p> Signup and view all the answers

    The theory of endosymbiosis suggests that mitochondria and chloroplasts originated from:

    <p>Ingested prokaryotic cells (D)</p> Signup and view all the answers

    What is the main function of the mitochondrial cristae?

    <p>They increase the surface area for ATP synthesis. (B)</p> Signup and view all the answers

    What is the primary difference between the process of binary fission used by bacteria and the process of cell division used by eukaryotic cells?

    <p>Binary fission is a simpler process that does not involve the formation of a spindle apparatus. (C)</p> Signup and view all the answers

    Which of the following statements supports the endosymbiotic theory of the origin of mitochondria and chloroplasts?

    <p>Mitochondria and chloroplasts have their own DNA, which is circular and similar to bacterial DNA. (B)</p> Signup and view all the answers

    What is the function of the peroxisome in a eukaryotic cell?

    <p>To break down fatty acids and detoxify harmful substances. (B)</p> Signup and view all the answers

    Which of the following statements accurately describes the relationship between mitochondria and chloroplasts?

    <p>Both mitochondria and chloroplasts are thought to have evolved from free-living prokaryotic cells. (C)</p> Signup and view all the answers

    What are ribosomes made of?

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

    What is the role of the signal peptide in protein synthesis?

    <p>It directs the protein to the correct organelle. (B)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a protein destined for the nucleus?

    <p>It is synthesized by ribosomes attached to the endoplasmic reticulum (ER). (C)</p> Signup and view all the answers

    What is the function of the Golgi apparatus in protein synthesis?

    <p>It modifies, sorts, and packages proteins. (B)</p> Signup and view all the answers

    What is the function of lysosomes in protein synthesis?

    <p>They break down proteins. (D)</p> Signup and view all the answers

    Based on the provided information, what could be the potential fate of a protein with a signal sequence similar to "Ser-Lys-Leu"?

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

    What does the term "multi-protein complex" refer to?

    <p>A group of different proteins working together. (C)</p> Signup and view all the answers

    Which of the following processes does NOT directly involve proteins?

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

    What pH level is maintained by proton pumps in the lysosomal membrane for optimal enzyme activity?

    <p>Acidic pH of around 5 (C)</p> Signup and view all the answers

    Which of the following functions is performed by vacuoles in plant cells?

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

    Which type of cell organelle is responsible for breaking down damaged or defective organelles?

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

    What is the primary metabolic role of mitochondria in cells?

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

    Which of the following components do mitochondria have that is specifically adapted for their function?

    <p>Cristae in the inner membrane (B)</p> Signup and view all the answers

    In which type of cells could you expect to find a higher number of mitochondria?

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

    Which of the following is a similarity between lysosomes and vacuoles?

    <p>Both digest materials (B)</p> Signup and view all the answers

    Which statement is true about lysosomes?

    <p>They are involved in autophagy. (C)</p> Signup and view all the answers

    Which of the following correctly describes the process that occurs to proinsulin?

    <p>Proinsulin is cleaved to form insulin (A)</p> Signup and view all the answers

    What is exocytosis in the context of insulin secretion?

    <p>The movement of insulin-containing vesicles to the cell membrane (D)</p> Signup and view all the answers

    What is the primary function of lysosomes?

    <p>Hydrolyze damaged proteins and macromolecules (A)</p> Signup and view all the answers

    Which of the following best describes the modification of proteins in the endomembrane system?

    <p>Proteins are tagged for sorting to their final destinations (B)</p> Signup and view all the answers

    What hormone's synthesis and secretion involve the endomembrane system?

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

    In what cellular process is the Golgi body primarily involved?

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

    What is diabetes mellitus typically a result of?

    <p>Defective insulin production or function (D)</p> Signup and view all the answers

    Flashcards

    Ribosomes

    Complexes of rRNA and proteins that synthesize proteins.

    Free ribosomes

    Ribosomes that float in cytosol and synthesize proteins for the cell's use.

    Bound ribosomes

    Ribosomes attached to the endoplasmic reticulum, making protein for export or membrane use.

    Protein synthesis

    Process where ribosomes assemble amino acids into polypeptides.

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    Signal peptide

    Short amino acid sequences that direct proteins to their specific destinations.

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    Nuclear localization signal (NLS)

    A specific signal sequence that directs proteins to the nucleus.

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    Golgi apparatus function

    Modifies, sorts, and packages proteins for secretion or use in the cell.

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    Secretory vesicles

    Transport proteins from the Golgi apparatus to the plasma membrane or lysosomes.

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    Eukaryotic Cell

    A cell with internal membranes dividing it into organelles.

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    Organelle

    Specialized structures within a eukaryotic cell, each with distinct functions.

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    Nucleus

    The organelle that houses the cell's genetic material.

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    Endomembrane System

    A system of membranes that compartmentalizes the cell.

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    Endoplasmic Reticulum (ER)

    Network of membranes involved in protein and lipid synthesis.

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    Mitochondria

    Organelles that produce energy (ATP) through respiration.

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    Chloroplasts

    Organelles in plant cells that convert sunlight into energy via photosynthesis.

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    Cytoskeleton

    A network of fibers that helps maintain cell shape and transport materials.

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    Nuclear Envelope

    A membrane surrounding the nucleus, continuous with the endoplasmic reticulum.

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    Rough ER

    Part of the ER studded with ribosomes, synthesizing proteins for secretion.

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    Smooth ER

    Part of the ER lacking ribosomes, involved in lipid synthesis and detoxification.

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    Golgi Apparatus

    Flattened sacs of membranes that modify, sort, and package proteins from the ER.

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    Vesicles

    Small membrane-bound sacs that transport materials within the cell.

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    Lysosomes

    Organelles containing digestive enzymes for breaking down waste and cellular debris.

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    Insulin

    A peptide hormone produced by pancreas beta cells that regulates blood glucose levels.

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    Preproinsulin

    The initial form of insulin synthesized as a single oligopeptide.

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    Proinsulin

    The form of insulin formed after the signal peptide is cleaved from preproinsulin.

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    Exocytosis

    A process by which secretory vesicles release their contents outside the cell.

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    Hydrolysis

    The chemical process where water breaks down polymers into monomers.

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    Proton pumps

    Transport proteins in lysosome membranes that maintain acidity.

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    Autophagy

    Process by which cells break down their own defective organelles.

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    Vacuoles

    Large vesicles from the ER and Golgi, performing various functions in cells.

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    Central vacuole

    A vacuole that regulates turgor pressure in plant cells.

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    Cristae

    Infoldings of the inner mitochondrial membrane, increasing surface area.

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    Cellular respiration

    Metabolic process that converts sugars and fats into ATP using oxygen.

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    Inner membrane of mitochondrion

    Divides mitochondrion into intermembrane space and matrix.

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    Intermembrane space

    Narrow region between inner and outer mitochondrial membranes.

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    Mitochondrial matrix

    Innermost space of mitochondria containing enzymes, DNA, and ribosomes.

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    Thylakoid

    Internal membrane-bound compartments in chloroplasts, stacked as grana.

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    Stroma

    The inner space of chloroplasts containing enzymes and DNA.

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    Endosymbiosis theory

    Explains the origin of mitochondria and chloroplasts from ingested bacteria.

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    Evidence of endosymbiosis

    Mitochondria and chloroplasts share characteristics with bacteria.

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    Study Notes

    Course Information

    • Course name: Biology 1 – Cells, Molecular Biology and Genetics
    • Course code: Biol 1000
    • Professor: Dr. Michael Cardinal-Aucoin
    • Semester: Winter 2025

    The Eukaryotic Cell

    • Eukaryotic cells possess internal membranes creating compartments called organelles.
    • Each organelle has a specialized function.
    • Examples of organelles
      • Nucleus
      • Endomembrane system (Endoplasmic reticulum, Golgi apparatus, Lysosomes, Vacuoles)
      • Mitochondria
      • Chloroplasts
      • Peroxisomes
      • Cytoskeleton

    Eukaryotes

    • Plant, animal, and protist cells share most of the same organelles.
    • Organelles vary in size, depending on their function.
    • Diagram comparing the structure of animal & plant cells

    Nucleus

    • Nucleus: the most conspicuous organelle in eukaryotes.
    • Stores the DNA.
    • Nuclear Envelope (a double membrane) surrounds the nucleus.
    • Nuclear Pores: gateways for molecules entering and leaving the nucleus.
    • Nucleolus: a dense region within the nucleus where rRNA is synthesized.
    • Chromatin: DNA organized with proteins (e.g., histones)
    • During cell division, chromatin condenses forming chromosomes

    More about the Nucleus

    • DNA, the genetic material, is organized into chromatin, connected with proteins, for instance, histones.
    • During cell division, chromatin thickens to produce distinct structures, chromosomes.

    DNA Measurement

    • The DNA in a single cell, stretched out end to end, measures roughly 6.5 kilometers.

    Nuclear Pore

    • Controls traffic in and out of the nucleus.
    • A multi-protein complex.
    • Specific molecules travel into or out of the nucleus.
    • Examples are Ribosomes, messenger RNA (mRNA).

    Ribosomes

    • Present in both prokaryotes and eukaryotes.
    • In eukaryotes, made in the nucleolus.
    • Complexes of rRNA and proteins.
    • Sites of protein synthesis
    • Can be free in the cytoplasm or bound to the endoplasmic reticulum membrane.

    Protein Synthesis

    • Free ribosomes synthesize proteins for use within the cytosol.
    • Membrane-bound ribosomes synthesize proteins destined for secretion or insertion into membranes (e.g., endoplasmic reticulum).

    Signal Peptides

    • Proteins have signal peptides, guiding them to their appropriate destination.

    Proteins Destined for Nucleus

    • Proteins meant for the nucleus have a nuclear localization signal (NLS).

    Endomembrane System

    • Interconnected network of membranes and organelles working together in a regulated fashion.
    • Examples of components
      • Nuclear envelope
      • Endoplasmic reticulum
      • Golgi apparatus
      • Lysosomes
      • Vacuoles
      • Plasma membrane

    Endoplasmic Reticulum

    • Extensive network of membranes.
    • Continuous with the nuclear envelope.
    • Accounts for more than half of the total membrane in many eukaryotic cells.
    • Two distinct regions (rough ER, smooth ER) differing in structure and function.

    Rough ER

    • Flattened sacs (cisternae) studded with ribosomes.
    • Synthesizes proteins to be secreted.
    • Synthesizes membrane components

    Smooth ER

    • Network of tubules.
    • Lacks ribosomes.
    • Involved in various metabolic processes (e.g., lipid synthesis, metabolism of carbohydrates, detoxification).
    • Storage of calcium ions.

    Golgi Apparatus

    • Looks like flattened membrane sacs (cisternae).
    • Not physically continuous with the endoplasmic reticulum(ER).
    • Processing center for proteins and lipids.
    • Modifies proteins and lipids produced by the endoplasmic reticulum
    • Synthesizes carbohydrates.
    • Sorts proteins to proper destinations (e.g., different membranes).

    Lysosomes

    • Specialized vesicles derived from the Golgi body.
    • Contain hydrolytic enzymes.
    • Digest damaged or unneeded macromolecules.
    • Maintain an acidic environment.
    • Not present in plant cells.
    • Involved in various aspects of cellular homeostasis through different processes (e.g., autophagy, phagocytosis).

    Vacuoles

    • Large vesicles derived from the endoplasmic reticulum and Golgi apparatus.
    • Various functions.
      • Food vacuoles: store food
      • Digestive vacuoles: act like lysosomes in plants
      • Contractile vacuoles: expel water from cells
      • Central vacuoles: (in many plant cells) regulate turgor pressure.

    Mitochondria

    • Sites of cellular respiration.
    • Generate ATP (chemical energy) from sugars, fats, and other fuels
    • Single or numerous, depending on cell needs.
    • Enclosed by two membranes (outer and inner):
      • Inner membrane is highly folded, forming cristae.
      • Mitochondrial matrix: space inside the inner membrane, containing enzymes, mitochondrial DNA, and ribosomes.
      • Membranes and matrix divide the cell into functional compartments.

    Chloroplasts

    • Capture light energy for photosynthesis (synthesizing sugars from CO2).
    • Have an outer and inner membrane, thylakoids inside.
    • Thylakoids organize light-capturing pigments.
    • Stroma: space containing chloroplast DNA, ribosomes, and enzymes necessary for photosynthesis.

    Origins of Mitochondria and Chloroplasts (Endosymbiosis)

    • Mitochondria and chloroplasts evolved from prokaryotes engulfed by ancestral eukaryotic cells.
    • Evidence for endosymbiotic theory: size similar to bacteria, their double layered membrane, and the fact that they possess their own DNA.

    Peroxisomes

    • Specialized metabolic compartments bound by a single membrane.
    • Involved in various metabolic processes (e.g., breakdown of fatty acids, detoxification of harmful molecules).
    • Produce hydrogen peroxide which is quickly broken down by an enzyme called catalase to water and oxygen.

    Endomembrane System: Examples (Insulin Synthesis)

    • Insulin: a peptide hormone produced by the pancreatic beta cells.
    • Insulin synthesis occurs in the secretory pathway where proteins are synthesized, tagged with signals for proper destination then modified by other parts of the endomembrane system.

    Other Information:

    • The endomembrane system plays a vital role in various cellular processes, including protein and lipid synthesis, secretion, and material degradation.

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    Description

    Test your knowledge on organelles found in eukaryotic cells with this quiz. Questions cover key functions and distinctions among various organelles, including the endoplasmic reticulum, Golgi apparatus, and cytoskeleton. Challenge yourself to identify the components and roles of these essential cell structures.

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