logo

CuriousTab

CuriousTab

Discussion


Home Biochemistry Cell Signalling and Transduction Comments

  • Question
  • Cell signaling can be classified into


  • Options
  • A. three distinct types based on the distance over which the signaling molecules act
  • B. two distinct types based on the distance over which the signaling molecules act
  • C. three distinct types based on the signaling molecules
  • D. none of the above

  • Correct Answer
  • three distinct types based on the distance over which the signaling molecules act 


  • Cell Signalling and Transduction problems


    Search Results


    • 1. The hormone or ligand can be considered as

    • Options
    • A. first messenger
    • B. second messenger
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 2. Which of the following is a second messenger?

    • Options
    • A. lnositol 1,4,5-triphosphate
    • B. Diacyl glycerol
    • C. Phospholipase C
    • D. Both (a) and (b)
    • Discuss
    • 3. SH2 domains specifically bind to

    • Options
    • A. phosphorylated serine residues
    • B. phosphorylated tyrosine residues
    • C. GDP
    • D. Ca2+
    • Discuss
    • 4. Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?

    • Options
    • A. Because other body tissues use a different signaling molecule
    • B. Because nitric oxide cannot cross cell membranes and enter the blood
    • C. Because nitric oxide breaks down quickly and thus cannot travel far
    • D. None of the above
    • Discuss
    • 5. Which of the following is true about a hydrophilic signaling molecule?

    • Options
    • A. Its receptor is located in the cytosol of the target cell
    • B. It might trigger a signal cascade that causes some effect in a cell
    • C. Since it can enter the cell, it directly affects some specific cell process
    • D. It is a steroid
    • Discuss
    • 6. The major second messengers are

    • Options
    • A. cAMP
    • B. cGMP
    • C. DAG
    • D. All of these
    • Discuss
    • 7. Simple nerve reflexes use signaling molecules called

    • Options
    • A. neurotransmitters
    • B. nitric oxides
    • C. G proteins
    • D. proteases
    • Discuss
    • 8. The binding of ligands to many G-proteins linked receptors leads to shortlived

    • Options
    • A. increase in the concentration of certain intracellular signaling molecules called second messenger
    • B. decrease in the concentration of certain intracellular signaling molecules called second messenger
    • C. increase in the concentration of certain extracellular signaling molecules called first messenger
    • D. decrease in the concentration of certain extracellular signaling molecules called first messenger
    • Discuss
    • 9. The enzyme that catalyzes the splitting of PIP2 into two molecules of inositol triphosphate (IP3) and diacylglycerol in cell signaling, is

    • Options
    • A. phosphokinase C
    • B. phospholipase C
    • C. phosphodiesterase C
    • D. lipokinase
    • Discuss
    • 10. Which of the following statement is incorrect?

    • Options
    • A. The principal lipophilic hormones that binds to receptors located in the plasma membranes are prostaglandins
    • B. Prostaglandins are synthesized from arachidonic acid
    • C. Prostaglandins act as paracrine signaling molecules
    • D. None of the above
    • Discuss


    Comments

    There are no comments.

Enter a new Comment