If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then the
A)amino acid inactivates the repressor.
B)enzymes produced are called inducible enzymes.
C)repressor is active in the absence of the amino acid.
D)amino acid acts as a corepressor.
E)amino acid turns on transcription of the operon.

Question

Quizplus · Accepted Answer

The trp operon is a negative feedback system where the amino acid tryptophan acts as a corepressor, binding to the repressor protein and activating it to prevent transcription of the operon. Therefore, if another operon encoding enzymes for making an essential amino acid is regulated like the trp operon, then the amino acid produced would likely act as a corepressor and activate the repressor protein to prevent transcription.

If a Particular Operon Encodes Enzymes for Making an Essential