9 The trp operon is regulated by a(n)activator and inducerrepressor and inducerC) activator and co-repressord) repressor and co-repressor
Question
What is the regulation mechanism of the trp operon?
- activator and inducer
- repressor and inducer
- activator and co-repressor
- repressor and co-repressor
Solution
The trp operon is regulated by a repressor and co-repressor. So, the correct answer is d) repressor and co-repressor.
Here's a step-by-step explanation:
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The trp operon is a group of genes that are used, or transcribed, together — that code for the components for production of tryptophan.
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The trp repressor is a protein that binds to the operator of the trp operon and inhibits transcription of the operon — it blocks the RNA polymerase.
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When tryptophan is plentiful, it binds to the trp repressor, which changes shape to bind even more tightly to the operator, blocking transcription.
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When tryptophan is absent, the repressor does not bind to the operator and the genes are transcribed.
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So, the trp operon is regulated by the presence or absence of tryptophan, which acts as a co-repressor. When tryptophan is present, it enhances the ability of the repressor to bind to the operator, thereby preventing transcription.
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