5. What molecule serves as a co-repressor for the trp operon?a) Ribosomec) trpRe) Glucoseb) Tryptophand) B-galactosidase
Question
- What molecule serves as a co-repressor for the trp operon?a) Ribosomec) trpRe) Glucoseb) Tryptophand) B-galactosidase
Solution
The molecule that serves as a co-repressor for the trp operon is b) Tryptophan.
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 codes for the components for production of tryptophan.
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The trp operon is present in many bacteria, and is regulated by a repressor protein. This repressor protein binds to the operator region of the operon and prevents transcription of the genes.
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When tryptophan is plentiful in the cell, it binds to the repressor protein, changing its shape so that it can bind to the operator. This stops the production of more tryptophan.
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So, in this case, tryptophan is acting as a co-repressor. It is not directly blocking the genes, but its presence allows the repressor protein to work.
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