Which of the Following is True About the Regulation of the Trp

Question

Which of the following is true about the regulation of the trp operon?
A)An aporepressor is involved.
B)A corepressor is involved.
C)Attenuation is one of the mechanism of control.
D)Negative control is involved.
E)All of the choices are true.

Accepted Answer

All of the choices are true about the regulation of the trp operon. An aporepressor (the inactive form of a repressor) is involved in controlling the trp operon. Tryptophan, the product of the operon, acts as a corepressor, binding to the aporepressor and activating it to bind to the operator region and inhibit transcription. Attenuation, a mechanism that regulates transcription by premature termination of mRNA synthesis, also plays a role in controlling the trp operon. Finally, the regulation of the trp operon involves negative control, where a repressor protein binds to the operator and prevents transcription.