Sample Questions — Regulation of gene expression
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MCQ
Q7. Which of the following would inhibit transcription of lac operon?
✅ Correct Answer: D
Repressor blocks RNA polymerase when bound to operator.
MCQ
Which of the following would be most affected if the promoter of lac operon is mutated?
✅ Correct Answer: D
Promoter is the site for RNA polymerase attachment.
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MCQ
Q3. Which of the following sequences correctly represents the order of components in the lac operon?
✅ Correct Answer: C
Gene I is upstream and separate from the operon.
MCQ
If the operator sequence is deleted in the lac operon, what would be the expected consequence?
✅ Correct Answer: C
Operator is the repressor’s binding site; deletion removes control.
MCQ
Q6. Which of the following statements is INCORRECT regarding the lac operon?
✅ Correct Answer: C
RNA polymerase binds to the promoter, not operator.
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