Question

The trp operon is known to operate by both negative repressible regulation of operator and attenuation. Which of the following statements does NOT support the reason as to why dual control exists to regulate the operon?
A. Attenuation and repression allow the cell to more sensitively respond to the tryptophan level.
B. Combined mechanism provides a much finer tuning of tryptophan synthesis regulation.
C. The repression alone is never complete, and some transcription can be initiated.
D. Repression responds to the cellular levels of tryptophan, while attenuation responds to the number of tRNA charged with tryptophan.
E. It is most likely due to the fact that the attenuation is the evolutionary relic, which by accident has remained.

Answer 1

It is most likely due to the fact that the attenuation is the evolutionary relic, which by accident has remained does not support the actual reason of the dual control to regulate the operon.

Answer: Option E

Explanation:

In bacteria transcription and translation carries out at the same time so or the termination of transcription in premature phase in bacteria uses a special mechanism which is called as attenuation T.

he attenuation in bacteria is a regulatory mechanism. Trp operon is the group of codes of the components. These operons are the actual functioning group of the DNA.