Q18-15TYU. In a short essay (100-150words),... [FREE SOLUTION]

Chapter 18: Q18-15TYU. (page 395)

In a short essay (100-150words), discuss how the processes shown in Figure 18.2 are examples of feedback mechanisms regulating biological systems in bacterial cells.

Short Answer

Expert verified

The tryptophan synthesis pathway and the process of inhibition are shown in the figure. The mechanism of inhibition in this tryptophan biosynthesis is feedback inhibition. In the bacterial system, the genes responsible for the enzymes convert the precursor into tryptophan.

Step by step solution

Description of gene regulation in bacterial cells

The bacterial cells are the prokaryotic cells that contain genes coding for tryptophan synthesis. The gene coding for the particular enzyme required for the tryptophan biosynthesis is produced by the operon present in the bacterial cells.

Trp operon

Tryptophan is produced from the precursor from the biosynthesis of tryptophan. Trp operon consists of structural genes made of the operator, promoter, and enhancer to produce the enzyme responsible for the biosynthesis of the trp operon.

Step 3: Feedback inhibition of tryptophan biosynthesis

The substances produced from the biosynthesis mechanism inhibit the same biosynthesis process, known as feedback inhibition. It happens when the products are available in surplus amounts.

The tryptophan is the end product produced in the tryptophan biosynthesis that blocks the enzyme involved in the tryptophan biosynthesis.

The tryptophan suppresses the trp D and trp E genes that code for the enzyme one. The tryptophan is the product that triggers the feedback inhibition in the trp operon present in the bacteria.