Discussion
Home ‣ Biochemistry ‣ Cell Signalling and Transduction Comments
- Question
The major second messengers are
Options- A. cAMP
- B. cGMP
- C. DAG
- D. All of these
- Correct Answer
- All of these
- 1. 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 Discuss
- 2. 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
- 3. 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
- 4. SH2 domains specifically bind to
Options- A. phosphorylated serine residues
- B. phosphorylated tyrosine residues
- C. GDP
- D. Ca2+ Discuss
- 5. 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
- 6. Simple nerve reflexes use signaling molecules called
Options- A. neurotransmitters
- B. nitric oxides
- C. G proteins
- D. proteases Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. In paracrine signaling, the signaling molecules affects only
Options- A. target cells close to the cell from which it was secreted
- B. target cells distant from its site of synthesis in cells of an endocrine organ
- C. both (a) and (b)
- D. none of the above Discuss
Cell Signalling and Transduction problems
Search Results
Correct Answer: three distinct types based on the distance over which the signaling molecules act
Correct Answer: first messenger
Correct Answer: Both (a) and (b)
Correct Answer: phosphorylated tyrosine residues
Correct Answer: Because nitric oxide breaks down quickly and thus cannot travel far
Correct Answer: neurotransmitters
Correct Answer: increase in the concentration of certain intracellular signaling molecules called second messenger
Correct Answer: phospholipase C
Correct Answer: None of the above
Correct Answer: target cells close to the cell from which it was secreted
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