16. Here is a genetic circuit: the first sub-circuit (promoter-operon) turns on

Question

16. Here is a genetic circuit: the first sub-circuit (promoter-operon) turns on the production of a protein which inhibits the transcription of the second sub-circuit (promoter-operon) which promotes the final protein production. This genetic circuit as a whole is a) inducible circuit b) repressible circuit 17. For the above genetic circuit, a small molecule (signal) inhibits the first sub-circuit. Deduce the new genetic circuit by drawing. What is the effect of the signal upon the whole circuit? The product is "the final protein production" . (4 points) a) Direct couple b) uncoupled c) inversely coupled

Explanation / Answer

16. This circuit may be inducible circuit because

The main difference between repressible and inducible circuit is the outcome that comes after the binding of effector molecule repressor. In inducible systems, when effector molecule binds to the repressor it decreases the connection between repressor and operator, the repressor is released then transcription is on. Example of inducible circuit is lac operon. In repressible systems, the effector molecule binds to the repressor enhances the connection between repressor and the operator, so the binding of repressor stops the transcription. Example is the trp operon.

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