Question

Arrange the steps of the regulation of the trp operon in order of occurrence. Levels of tryptophan in the cell are low. Transcription of the gene stops.

-Enzymes produced from the trp genes catalyze tryptophan production.
-Sufficient quantities of tryptophan make further synthesis unnecessary.
-Tryptophan activates the trp repressor protein.
-RNA polymerase binds to the promoter, allowing transcription of the trp genes to proceed.
-The trp repressor protein blocks RNA polymerase from binding to the promoter.
-The trp repressor protein binds to the operator.

Answer 1

The regulation of the trp operon, which controls tryptophan synthesis in E. coli, is ordered from the detection of low tryptophan levels to the cessation of gene transcription when tryptophan levels are sufficient.

Step-by-step explanation:

The regulation of the trp operon follows a specific order of occurrence in response to the cellular levels of tryptophan. When tryptophan levels are low, the operon is active, leading to the synthesis of enzymes that catalyze the production of tryptophan. Here are the appropriate steps, arranged in order:

Levels of tryptophan in the cell are low.

RNA polymerase binds to the promoter, allowing transcription of the trp genes to proceed.

Enzymes produced from the trp genes catalyze tryptophan production.

Sufficient quantities of tryptophan make further synthesis unnecessary.

Tryptophan activates the trp repressor protein.

The trp repressor protein binds to the operator.

The trp repressor protein blocks RNA polymerase from binding to the promoter.

Transcription of the gene stops.