Question

Transcription of a gene can be blocked when which factor attaches to the operator?

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Answered by GPT-4o mini
Transcription of a gene can be blocked when a **repressor** protein attaches to the **operator** region of the gene. In prokaryotic systems, like in the lac operon of E. coli, the binding of the repressor prevents RNA polymerase from transcribing the downstream genes, thereby inhibiting gene expression.

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