Biochemistry Questions and Answers – Principles of Gene Regulation

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Principles of Gene Regulation”.

1. Which of the following is not an example of housekeeping genes?
a) RNA polymerase
b) r-RNA genes
c) Beta galactosidase
d) Enzymes required for basic metabolic pathways common to most cells
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2. Lactose utilization by E. coli requires ____________
a) Lac-Z
b) Lac-A
c) Lac-Y
d) Lac-l
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3. The lactose repressor is encoded by ____________
a) Lac-l
b) Lac-A
c) Lac-Y
d) Lac-Z
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4. Where does a repressor bind an operon?
a) Operator
b) Promoter
c) Inducer
d) Catabolite activator site
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5. Lac repressor dissociates from its operator when the repressor binds to ____________
a) Heat shock module
b) Promoter
c) Inducer
d) Catabolite activator site
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6. The lac repressor has which of the following DNA-binding motif?
a) Helix-turn-helix
b) Zinc finger
c) Homeodomain
d) Leucine zipper
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7. Which of the following are the structural motifs that mediate protein-protein interactions?
a) Leucine zipper and basic helix-loop-helix
b) Homeodomain
c) Zinc finger
d) Helix-turn-helix
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8. If lactose and glucose are provided in the growth medium of a culture of E. coli ____________
a) Lactose operon is not transcribed
b) Lactose metabolism is favored
c) Both lactose and glucose are metabolized at same rate
d) Adenylate cyclase is activated
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9. Which of the following is not required for the expression of genes in the lactose operon?
a) lacl gene product
b) cAMP
c) Allolactose
d) Adenylate cyclase
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10. Which out of the following is not an example of an inducible operon?
a) Lactose operon
b) Galactose operon
c) Maltose operon
d) Tryptophan operon
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Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.