What happens when tryptophan is present? a. The repressor...

Name: Problem 56, Chapter 16: Biology for AP Courses
Uploaded: 2021-04-16T23:27:02-08:00
Duration: 2 min 52 s
Channel: Eric Goldman
Description: What happens when tryptophan is present? a. The repressor binds to the operator, and RNA synthesis is blocked. b. RNA polymerase binds to the operator, and RNA synthesis is blocked. c. Tryptophan binds to the repressor, and RNA synthesis proceeds. d. Tryptophan binds to RNA polymerase, and RNA synthesis proceeds.

What happens when tryptophan is present? a. The repressor binds to the operator, and RNA synthesis is blocked. b. RNA polymerase binds to the operator, and RNA synthesis is blocked. c. Tryptophan binds to the repressor, and RNA synthesis proceeds. d. Tryptophan binds to RNA polymerase, and RNA synthesis proceeds.

What happens when tryptophan is present?
a. The repressor binds to the operator, and RNA synthesis is blocked.
b. RNA polymerase binds to the operator, and RNA synthesis is blocked.
c. Tryptophan binds to the repressor, and RNA synthesis proceeds.
d. Tryptophan binds to RNA polymerase, and RNA synthesis proceeds.

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Key Concepts

Negative Regulation

Negative regulation is a mechanism of gene regulation where the binding of a repressor to an operator or regulatory region inhibits the initiation of transcription. This provides a means for the cell to quickly downregulate gene expression in response to environmental or cellular signals.

Corepressor Function

A corepressor is a small molecule that binds to a repressor protein and influences its activity. In many regulatory systems, the presence of a corepressor induces a conformational change in the repressor, enhancing its ability to bind to DNA and block transcription.

Operon Model

The operon model explains how a group of genes can be controlled together by regulatory sequences. In prokaryotic cells, genes involved in a similar pathway are clustered together and transcribed as a single mRNA, which allows for efficient coordinated regulation of gene expression.

Repressor Protein

A repressor protein is a regulatory protein that can bind to specific DNA sequences known as operators. When bound, the repressor protein typically inhibits transcription by preventing RNA polymerase from transcribing the downstream genes, thereby controlling gene expression.

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