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Tryphophan operon of E. coli has...

Tryphophan operon of E. coli has

A

3 structural genes

B

5 structural genes

C

10 structural genes

D

7 structural genes

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The correct Answer is:
To solve the question regarding the Tryptophan operon of E. coli, we will follow these steps: ### Step-by-Step Solution: 1. **Identify the Operon**: The Tryptophan operon is also known as the TRP operon. It is a group of genes that are involved in the biosynthesis of the amino acid tryptophan in E. coli. 2. **Understand the Function**: The TRP operon is active when the levels of tryptophan are low in the environment. Conversely, it is turned off when tryptophan levels are high. This is a classic example of a negative feedback mechanism in gene regulation. 3. **Locate the Structural Genes**: The TRP operon consists of five structural genes. These genes are typically labeled as trpE, trpD, trpC, trpB, and trpA. Each of these genes encodes for an enzyme that is involved in the pathway for synthesizing tryptophan. 4. **Summarize the Information**: The Tryptophan operon has a total of **five structural genes** that are responsible for the biosynthesis of tryptophan. 5. **Final Answer**: Therefore, the Tryptophan operon of E. coli has five structural genes.
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