Biology 1401 Chapter 9 Cell Communication

25 Questions | Total Attempts: 937

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Communication Quizzes & Trivia

Questions and Answers
  • 1. 
    Located on or within the cell are _________ proteins, each of which has a three dimensional shape complementary to that of a specific signal molecule.
    • A. 

      Amplification

    • B. 

      Monoclonal

    • C. 

      Transmembranal

    • D. 

      Receptor

    • E. 

      Messenger

  • 2. 
    The space into which neurotransmitters are released is called a chemical
    • A. 

      Synapse.

    • B. 

      Junction.

    • C. 

      Channel.

    • D. 

      Desmosome.

    • E. 

      Vesicle.

  • 3. 
    Which of the following is not a second messenger?
    • A. 

      CAMP

    • B. 

      Ca++ions

    • C. 

      Diacyl glycerol (DAG)

    • D. 

      Inositol-1,4,5-triphosphate (IP3)

    • E. 

      Phospholipase C

  • 4. 
    Specific protein receptors are present for all of the following except
    • A. 

      Signal amplification.

    • B. 

      Signal transduction.

    • C. 

      Intracellular receptors binding to DNA.

    • D. 

      Signaling to other cells.

    • E. 

      Cell junctions.

  • 5. 
    Communication between cells can occur by all of the following basic mechanisms except
    • A. 

      Direct contact.

    • B. 

      Intracellular signaling.

    • C. 

      Paracrine signaling.

    • D. 

      Endocrine signaling.

    • E. 

      Synaptic signaling.

  • 6. 
    Signals with short-lived, local effects are called
    • A. 

      Direct contact.

    • B. 

      Endocrine signals.

    • C. 

      Paracrine signals.

    • D. 

      Synaptic signals.

  • 7. 
    Synaptic signaling requires which of the following to be released into the synaptic gap?
    • A. 

      Hormones

    • B. 

      Internal receptors

    • C. 

      Genes

    • D. 

      Neurotransmitters

    • E. 

      Lipids

  • 8. 
    Signal molecules activate intracellular receptors in
    • A. 

      Chromosomes.

    • B. 

      Vesicles.

    • C. 

      Target cells.

    • D. 

      Skin cells.

    • E. 

      Surface cells.

  • 9. 
    The molecules that convert extracellular signals into intracellular ones are
    • A. 

      Neurotransmitters.

    • B. 

      Peptide hormones.

    • C. 

      Cell surface receptors.

    • D. 

      Growth factor proteins.

    • E. 

      Genes.

  • 10. 
    • A. 

      Their amino acid chains wind back and forth across the membrane.

    • B. 

      They close in response to binding of the signal molecule.

    • C. 

      A pore exists in the center of the protein.

    • D. 

      The pore connects the extracellular fluid with the cytoplasm.

    • E. 

      The pore is big enough for ions to pass through it.

  • 11. 
    The class of cell surface receptors that acts indirectly on plasma membrane-bound enzymes or ion channels is called
    • A. 

      G-protein-coupled receptors.

    • B. 

      Gated ion channels.

    • C. 

      Enzymatic receptors.

    • D. 

      Second messenger receptors.

  • 12. 
    • A. 

      G proteins provide a link between the receptor and effector protein.

    • B. 

      G proteins can propagate the signal by either the G~ or the G(by) components.

    • C. 

      G proteins are heterotrimeric.

    • D. 

      Associated G proteins become active by exchanging GTP and GDP.

    • E. 

      Activated G protein diffuses away from the receptor.

  • 13. 
    • A. 

      Sodium, potassium ions

    • B. 

      Amino acids, proteins

    • C. 

      Steroids, lipids

    • D. 

      Sugars, starches

    • E. 

      CAMP, calcium ions

  • 14. 
    A small number of surface receptors can ultimately generate a large intracellular response, as each step of the pathway is often expanded by
    • A. 

      Enzymatic receptors.

    • B. 

      Gated ion channels.

    • C. 

      Signal amplification.

    • D. 

      G-protein-coupled receptors.

  • 15. 
    Most cells are in physical contact with other cells at all times by forming permanent connections called
    • A. 

      Cell junctions.

    • B. 

      Gated ion channels.

    • C. 

      Enzymatic receptors.

    • D. 

      G-protein-coupled receptors.

    • E. 

      Cell surface markers.

  • 16. 
    Small molecules or ions can pass from one cell to another through
    • A. 

      Tight junctions.

    • B. 

      Gap junctions.

    • C. 

      Diffusion spheres.

    • D. 

      Desmosomes.

    • E. 

      Adherens junctions.

  • 17. 
    In plants, cell-cell junctions can only occur at gaps in the cell walls through cytoplasmic connections that form across the plasma membranes of the touching cells. These junctions are called
    • A. 

      Desmosomes.

    • B. 

      Tight junctions.

    • C. 

      Plasmodesmata.

    • D. 

      The cellulose matrix.

    • E. 

      Adhering junctions.

  • 18. 
    Chemically-gated ion channels are receptor proteins through which ions pass. A cell biologist has blocked these channels in a lab rat's liver tissue by using a chemical that
    • A. 

      Prohibits binding of a signal molecule.

    • B. 

      Prohibits ions from entering the cell via active transport.

    • C. 

      Causes ions to move in the opposite direction of the ion gradient.

    • D. 

      Prohibits second messenger signaling.

  • 19. 
    What characteristics do all cell surface receptors share?
    • A. 

      They are composed of hydrophilic proteins.

    • B. 

      They all must bind to a molecule to be activated.

    • C. 

      They all result in creation of an ion channel.

    • D. 

      They include the activation of a G protein.

  • 20. 
    • A. 

      Phosphate groups are efficient second messengers.

    • B. 

      Protein kinase and phosphatases are abundant in most cells.

    • C. 

      The hydolysis of bound GTP results in GDP and Pi.

    • D. 

      The addition or removal of a phosphate group can expose or hide potential binding sites in proteins.

  • 21. 
    Which of the following proteins phosphorylates MAP kinase kinase?
    • A. 

      MAP kinase

    • B. 

      MAP kinase kinase

    • C. 

      MAP kinase kinase kinase

    • D. 

      MAP phosphatase

  • 22. 
    Long-lived; affects cells very distant from the releasing cell.
    • A. 

      Paracrine signaling

    • B. 

      Direct contact

    • C. 

      Endoctine signaling

    • D. 

      Synaptic signaling

  • 23. 
    Signal molecules on a cell membrane interact with molecules on a neighboring cell membrane.
    • A. 

      Paracrine signaling

    • B. 

      Direct contact

    • C. 

      Endoctine signaling

    • D. 

      Synaptic signaling

  • 24. 
    Short lived; used by nerve cells.
    • A. 

      Paracrine signaling

    • B. 

      Direct contact

    • C. 

      Endoctine signaling

    • D. 

      Synaptic signaling

  • 25. 
    Short-lived, causing local effects.
    • A. 

      Paracrine signaling

    • B. 

      Direct contact

    • C. 

      Endoctine signaling

    • D. 

      Synaptic signaling