Biochemistry Multiple Choice Questions on “Molecular Mechanisms of Signal Transduction”.
1. The information which is represented by a signal is detected by specific receptors and converted to a cellular response; this conversion is called _____________
A. Signal amplification
B. Signal transversion
C. Signal transduction
D. Signal integration
Answer: C
Clarification: The information which is represented by a signal is detected by specific receptors and converted to a cellular response; this conversion is called signal transduction.
2. Signal molecule fits the binding site on its complementary receptor called as _____________
A. Specificity
B. Amplification
C. Integration
D. Cooperativity
Answer: A
Clarification: Number of affected molecules increases geometrically in an enzyme cascade in amplification.
A regulatory outcome result from integrated input from both receptors is in integration.
3. Number of affected molecules increases geometrically in an enzyme cascade in _____________
A. Specificity
B. Amplification
C. Adaptation
D. Integration
Answer: B
Clarification: Signal molecule fits its binding site on its complementary receptor called as specificity.
Receptor is removed from cell surface in adaptation.
A regulatory outcome result from integrated input from both receptors is in integration.
4. Receptor is removed from cell surface in _____________
A. Specificity
B. Amplification
C. Adaptation
D. Integration
Answer: C
Clarification: A regulatory outcome result from integrated input from both receptors is in integration.
Signal molecule fits its binding site on its complementary receptor called as specificity.
Number of affected molecules increases geometrically in an enzyme cascade in amplification.
5. Regulatory outcome results from integrated input from both receptors is in _____________
A. Specificity
B. Amplification
C. Adaptation
D. Integration
Answer: D
Clarification: Receptor is removed from cell surface in adaptation.
Signal molecule fits binding site on its complementary receptor called as specificity.
Number of affected molecules increases geometrically in an enzyme cascade in amplification.
6. Acetylcholine receptor ion channel is an example of _____________
A. Gated ion channel
B. Receptor enzymes
C. Membrane protein
D. Nuclear protein
Answer: A
Clarification: Acetylcholine receptor ion channel is an example of gated ion channel.
7. How many types of signal transducers are there?
A. 3
B. 4
C. 5
D. 6
Answer: D
Clarification: Gated ion channels, receptor enzymes, membrane proteins that act through G protein, nuclear proteins, membrane proteins and adhesion receptors are the 6 types of signal transducers.
8. Which of the following is a nuclear receptor protein?
A. Steroid receptor
B. Adhesion receptor
C. Serpentine receptor
D. Receptor with no intrinsic enzyme activity
Answer: A
Clarification: Steroid receptor is a nuclear receptor protein.
9. Receptor proteins that indirectly activate enzymes that generate intracellular second messengers are _____________
A. Steroid receptors
B. Serpentine receptors
C. Adhesion receptors
D. Receptor enzymes
Answer: B
Clarification: Receptor proteins that indirectly activate enzymes that generate intracellular second messengers are serpentine receptors.
10. Insulin receptor is an example of _____________
A. Steroid receptors
B. Serpentine receptors
C. Adhesion receptors
D. Receptor enzymes
Answer: D
Clarification: Insulin receptor is nuclear receptor.
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