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Lyrx
8 days ago
5

The ara operon is controlled by a regulator protein that exerts ________.

Biology
1 answer:
Tresset [654]8 days ago
7 0

The AraC protein associated with the ara operator functions as a repressor to prevent transcription of the ara operon. In the presence of arabinose, the AraC protein acts as an activator; however, in its absence, it serves as a repressor. When arabinose is not available, AraC remains as a
homodimer. One AraC molecule attaches to the ara initiator while another binds to a distinct regulatory region in the DNA known as the ara operator.

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