题目
题目

BIOL_1105_60452_202506 Lesson 14 Homework

多重下拉选择题

The trp operon is transcribed to synthesize the amino acid tryptophan. When tryptophan is present in the environment, the trp operon is NOT transcribed . On the other hand, when tryptophan is absent in the environment, the trp operon is transcribed . The trp operon is controlled by a(n) repressor protein through negative control .

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思路分析
The prompt describes the classic regulation of the trp operon in bacteria and provides four elements to evaluate. Option 1: NOT transcribed. This aligns with the regulatory logic: when tryptophan is present, tryptophan acts as a corepressor that enables the repressor protein to bind to the operator and block transcription. Therefore, the operon is NOT transcribed in the ......Login to view full explanation

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