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lana66690 [7]
2 years ago
6

Which of the following features of the trp operon is most essential to the process of attenuation independent of the repressor p

rotein?
The order of the structural genes, E, D, C, B, A
Allosteric modifications as a result of tryptophan binding.
The operator sequence (trpO)
The ability of sequences within the leader mRNA to pair with one another and form stem-lopp structures
Biology
1 answer:
diamong [38]2 years ago
4 0

Answer:

The ability of sequences within the leader mRNA to pair with one another and form stem-lopp structures

Explanation:

A form of feedback regulation controls the  trp operon by regulating transcription termination, a mechanism referred to as Attenuation.

-In the presence of high concentrations of tryptophan, RNA polymerase ceases transcription  shortly after initiation in a region called the leader sequence.

-If  the concentration of tryptophan is low, transcription does not  terminate until the entire operon is transcribed. The mechanism of attenuation links alternative RNA secondary structures  to transcription termination.

-Immediately after transcription,  RNA from the leader region folds into one of two alternative  secondary structures.

-One of these structures is a transcription  termination signal that stops RNA polymerase from continuing  to the end of the operon.

-The alternative structure does not  contain a transcription termination signal and allows transcription of a single mRNA that encodes all the structural genes.  

-The decision as to which of the two alternative RNA structures  formed is regulated by the concentration of tryptophan.

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