The lac operon is an inducible operon. Which of the following best describes this type...
BIOLOGY
SAT 2021
The lac operon is an inducible operon. Which of the following best describes this type of operon?
- A. The operon is usually on and has an active repressor
- B. The operon is usually on and has an inactive repressor
- C. The operon is usually off and has an inactive repressor
- D. The operon is usually off and has an active repressor
Correct Answer: D. The operon is usually off and has an active repressor
Explanation
With an inducible system, the operon is off, meaning its repressor is active, or actively repressing the system from turning on. Inducible operons are opposite to a repressible operon, which is always on until it is repressed.
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