If a Particular Operon Encodes Enzymes for Making an Essential

question 72

Multiple Choice

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then

• A) the amino acid inactivates the repressor.
• B) the enzymes produced are called inducible enzymes.
• C) the repressor is active in the absence of the amino acid.
• D) the amino acid acts as a corepressor.
• E) the amino acid turns on transcription of the operon.

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