Cell Signalling and Transduction problems
- 1. Which of the following processes involve the combining of a message from one signaling molecule with that of another to either enhance or inhibit a cellular effect?
Options- A. Signal transduction
- B. Signal reception
- C. Signal integration
- D. Signal amplification Discuss
Correct Answer: Signal integration
- 2. Which of the following statements about G proteins is false?
Options- A. They are involved in signal cascades
- B. They bind to and are regulated by guanine nucleotides
- C. They become activated when bound to GDP
- D. They must be active before the cell can make needed cAMP Discuss
Correct Answer: They become activated when bound to GDP
- 3. A cell is known to respond to a particular signaling molecule. Which of the following must be true of this cell?
Options- A. It is in the heart muscle
- B. It is also the site of production for the signaling molecule
- C. It contains the receptor for the signaling molecule
- D. It is incapable of signal transduction Discuss
Correct Answer: It contains the receptor for the signaling molecule
- 4. The signaling molecules called steroid hormones
Options- A. are made in one location of the body but have their effects some distance away
- B. are hydrophilic and so cannot penetrate the plasma membrane
- C. bind to cell surface receptors to trigger chemical cascades
- D. never enter the blood of humans Discuss
Correct Answer: are made in one location of the body but have their effects some distance away
- 5. In the signal transduction mechanism known as protein phosphorylation
Options- A. the signaling molecule binds to a surface receptor
- B. receptor kinases play a key role in triggering the signal cascade
- C. phosphorylated proteins act with enzymes to trigger the signal cascade
- D. All of the above Discuss
Correct Answer: All of the above
- 6. Which of the following is a hormone whose action requires a cell surface receptor?
Options- A. Nitric oxide
- B. Progesterone
- C. Adrenaline
- D. Growth factors Discuss
Correct Answer: Adrenaline
- 7. Small charged molecules, often biogenic amines function as
Options- A. hormones
- B. neurotransmitters
- C. both (a) and (b)
- D. none of these Discuss
Correct Answer: both (a) and (b)
- 8. Which of the following comes under the category of cell surface receptor?
Options- A. Enzyme linked receptors
- B. Ion-channel linked receptors
- C. G protein linked receptors
- D. All of these Discuss
Correct Answer: All of these
- 9. Which of the following statement is correct?
Options- A. Cell communicate with one another in multicellular organisms using extracellular signaling molecules or hormones
- B. Cell communicate with one another in unicellular organisms using extracellular signaling antigen and antibody
- C. Cell communicate with one another in multicellular organisms using intracellular signaling molecules only
- D. Cell communicate with one another in unicellular organisms using intracellular signaling antigen and antibody Discuss
Correct Answer: Cell communicate with one another in multicellular organisms using extracellular signaling molecules or hormones
- 10. In vasodilation, proper nerve signals sent to blood vessels cause
Options- A. the release of nitric oxide from endothelial cells
- B. relaxation of smooth muscle cells
- C. reduced blood pressure
- D. All of the above Discuss
Correct Answer: All of the above
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