Ansc 221: Cells, Metabolism, And Genetics

224 Questions | Total Attempts: 74

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Metabolism Quizzes & Trivia

Questions and Answers
  • 1. 
    Plasma membranes are a feature of ______.
    • A. 

      Prokaryotic cells

    • B. 

      Eukaryotic cells

    • C. 

      All cells

    • D. 

      Plant cells only

    • E. 

      Animal cells only

  • 2. 
    Which of the following is NOT a component of plasma membranes?
    • A. 

      Glycosylated proteins

    • B. 

      Glycosylated nucleic acids

    • C. 

      Phospholipids

    • D. 

      Glycolipids

    • E. 

      Cholesterol

  • 3. 
    Which of the following are true of the plasma membrane?
    • A. 

      It is composed of an extracellular and intracellular layer of phospholipids

    • B. 

      The membrane contains peripheral proteins

    • C. 

      Integral proteins span through the membrane

    • D. 

      The membrane contains glycolipids and glycoproteins

    • E. 

      B, C, and D

  • 4. 
    The pathway from the ER to the Golgi to the plasma membrane is called the ______.
    • A. 

      Protein synthesis pathway

    • B. 

      Protein sorting pathway

    • C. 

      Trans-Golgi pathway

    • D. 

      Secretory pathway

    • E. 

      Route 66

  • 5. 
    The process of covalently attaching a carbohydrate to a protein or lipid is ______.
    • A. 

      Glycosylation

    • B. 

      Acetylation

    • C. 

      Protein synthesis

    • D. 

      Esterification

    • E. 

      Facilitated diffusion

  • 6. 
    Which of the following are 2 major functions of the SRP protein/RNA complex?
    • A. 

      Attaches to the nucleolus where ribosome subunits are assembled AND serves as a docking station for charged tRNAs

    • B. 

      Recognizes the ER signal sequence and pauses translation AND SRP binds to receptor in ER membrane, which docks the ribosome over a channel protein

    • C. 

      Provides a channel for electrolytes to enter and leave the endoplasmic reticulum AND recognizes the ER signal sequence and pauses translation

  • 7. 
    Facilitated diffusion but not passive diffusion requires energy.
    • A. 

      True

    • B. 

      False

  • 8. 
    The following solutes have very low permeability through the plasma membrane.
    • A. 

      Very small uncharged polar molecules

    • B. 

      Water and urea

    • C. 

      Charged polar molecules and macromolecules

    • D. 

      Polar organic molecules

    • E. 

      All of the above

  • 9. 
    Water can freely diffuse through animal cell membranes.
    • A. 

      True

    • B. 

      False

  • 10. 
    Which of the following organelles would become more active when a cell is induced to produce more protein secretions?
    • A. 

      Nucleus, SER, vacuoles, plasma membrane

    • B. 

      Nucleus, RER, Golgi, mitochondria

    • C. 

      RER, Golgi, peroxisomes

    • D. 

      Mitochondria, Golgi, lysosomes

    • E. 

      All components of the endomembrane system

  • 11. 
    Approximately 75% of all genes encode transmembrane proteins.
    • A. 

      True

    • B. 

      False

  • 12. 
    Which of the following is the major lipid found in membranes?
    • A. 

      Steroids

    • B. 

      Phospholipids

    • C. 

      Cholesterol

    • D. 

      Triglycerides

    • E. 

      Saturated fatty acids

  • 13. 
    Which of the following is NOT true of the plasma membrane?
    • A. 

      It is composed of an extracellular and intracellular layer of phospholipids

    • B. 

      The membrane contains peripheral proteins

    • C. 

      The membrane contains glycolipids and glycoproteins

    • D. 

      Integral proteins span through the membrane

    • E. 

      The extracellular and intracellular layer of leaflets are highly symmetrical

  • 14. 
    Scientists unearth a Wooly Mammoth from the Siberian Ice Sheath and discover that a eukaryotic "amoeba"-like cell is still alive. Which component of the cell membrane might contribute to maintaining the fluidity of plasma membranes under freezing conditions?
    • A. 

      Peripheral proteins

    • B. 

      High levels of long fatty acyl tails within the lipid bilayer

    • C. 

      High levels of unsaturated fatty acyl tails within the lipid bilayer

    • D. 

      Absence of cholesterol

    • E. 

      High levels of saturated fatty acyl tails within the lipid bilayer

  • 15. 
    The movement of water across a semipermeable membrane to balance solute concentrations is called osmosis and requires energy output.
    • A. 

      True

    • B. 

      False

  • 16. 
    Carbohydrates of the plasma membrane ____.
    • A. 

      Are associated with a protein or lipid

    • B. 

      Are located on the outer surface of the plasma membrane

    • C. 

      Can function as cell markers for recognition by other cells

    • D. 

      A and B

    • E. 

      All of the above

  • 17. 
    A transmembrane protein in the plasma membrane is glycosylated at two sites in the polypeptide sequence. One site is Asn-Val-Ser and the other is Asn-Gly-Thn. Where in the protein would you expect these two sites to be found?
    • A. 

      In hydrophilic regions that project into the extracellular environment

    • B. 

      In hydrophilic regions the project into the cytosol

    • C. 

      In transmembrane segments

    • D. 

      Could be anywhere

    • E. 

      A and B

  • 18. 
    What structural features of a membrane are major contributors to selective permeability?
    • A. 

      Glycolipids on the outer surface of the membrane

    • B. 

      Peripheral membrane proteins on the inside of the membrane

    • C. 

      Phospholipid bilayer

    • D. 

      Lipid exchage proteins

    • E. 

      C and D

  • 19. 
    Both ______ and _______ are performed by transmembrane proteins, but the latter requires the input of some types of energy.
    • A. 

      Diffusion, facilitated diffusion

    • B. 

      Facilitated diffusion, active transport

    • C. 

      Diffusion, active transport

    • D. 

      Active transport, osmosis

    • E. 

      Osmosis, diffusion

  • 20. 
    What term is used to describe the process in which water is moved across a membrane to try and equilibrate solute concentration on either side of the membrane?
    • A. 

      Osmosis

    • B. 

      Diffusion

    • C. 

      Facilitated diffusion

    • D. 

      Passive diffusion

    • E. 

      Active transport

  • 21. 
    An electrochemical gradient occurs with solutes that have a net positive or negative charge.
    • A. 

      True

    • B. 

      False

  • 22. 
    If cells are in a _____ environment, this means that the concentration of a solute is ______ outside the cell than inside.
    • A. 

      Hypertonic, higher

    • B. 

      Hypotonic, lower

    • C. 

      Hypotonic, higher

    • D. 

      Hypertonic, lower

    • E. 

      A and B

  • 23. 
    Secreted proteins most likely will pass through the _____, particularly if they are ____ prior to being moved out of the cell.
    • A. 

      Rough ER, activated

    • B. 

      Nucleus, phosphorylated

    • C. 

      Golgi apparatus, glycosylated

    • D. 

      Smooth ER, translated

    • E. 

      Lysosome, cleaved

  • 24. 
    The process by which large macromolecules are transported outside the cell via vesicle formation at the Golgi apparatus and subsequent fusion with the plasma membrane is called ______.
    • A. 

      Facilitated diffusion

    • B. 

      Active transport

    • C. 

      Endocytosis

    • D. 

      Exocytosis

  • 25. 
    All cells of a multicellular organism may not respond in the same manner to a particular ligand that binds to a cell surface receptor. The difference in response may be due to _____.
    • A. 

      The type of receptor for the ligand that the cell expresses

    • B. 

      The type of signal transduction pathways that the cell expresses

    • C. 

      The affinity of the ligand for the receptor in a given cell type

    • D. 

      The type of target proteins that the cell expresses

    • E. 

      All of the above

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