Question

in a repressible operon, excess product acts as a corepressor to increase transcription of the operon.

true or false

true

false

Explanation:

Analyze the mechanism of a repressible operon

In a repressible operon, the operon is normally active (transcribing). When an excess of the metabolic product (such as tryptophan) accumulates, it binds to an inactive repressor protein as a corepressor.

Determine the effect on transcription

The binding of the corepressor activates the repressor, allowing it to bind to the operator region. This blockages decreases or shuts down transcription of the operon, rather than increasing it. Therefore, the statement is false.

Answer:

• True
• False (Correct answer)