Respuesta :
In bacterial cells, the tryptophan operon encodes the genes needed to synthesize tryptophan. What happens when the concentration of tryptophan inside a cell is high, it activates the tryptophan repressor, which shuts down expression of the tryptophan operon. Correct answer: letter C.
When the concentration of tryptophan inside a cell is high, the tryptophan repressor binds to the operon, preventing its expression. This is known as a negative feedback mechanism, as the increased concentration of tryptophan shuts down its own synthesis. This helps to ensure that the cell does not waste resources on excess tryptophan synthesis when the cell already has enough.
What are bacterial cells?
Are single-celled organisms that are found everywhere in the environment. A bacterial cell is composed of prokaryotic cells which are much simpler than the cells of other organisms. They have a cell wall that protects the cell, a small cytoplasmic membrane, and a single circular DNA molecule that contains the genetic information of the cell.
Bacterial cells use energy to produce proteins and other molecules necessary for their survival. They reproduce by splitting into two daughter cells.
In the bacterial cell, the trytophan operon encodes the genes needed to synthesize tryptophan. When the concentration of typtophan inside the cell is high:
A) It inactivates the tryptophan repressor which shuts down the tryptophan operon.
B) It inactivates the tryptophan repressor allowing transcription of the tryptophan operon.
C) It activates tytophan repressor which shuts down the tytophan operon.
Learn more about the bacterial cell:
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