Which of the Following Is the Best Example of Derepression

question 42

Multiple Choice

Which of the following is the best example of derepression?

• A) Switching on of the trp operon in the presence of tryptophan
• B) Switching off of the trp operon in the presence of tryptophan
• C) Switching off of the trp operon in the absence of tryptophan
• D) Switching off of the lac operon by the presence of glucose in the medium
• E) Switching on of the lac operon in the presence of lactose

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