Enzyme transacetylase produced by lac operon in E.coli

Options

A. Split lactose into glucose and galactose
B. Is required for entry of lactose
C. Is coded by gene a
D. Both (1) and (2)

Answer

### Step-by-Step Solution:

1. **Understanding the Lac Operon**: The lac operon is a genetic system found in E. coli that is responsible for the metabolism of lactose. It consists of structural genes that encode for enzymes necessary for the utilization of lactose as a source of energy.

2. **Identifying the Components of the Lac Operon**: The lac operon includes several key components:
- **CAP site**: Where the CAP protein binds to activate the operon.
- **Promoter**: The region where RNA polymerase binds to initiate transcription.
- **Operator**: The segment where lactose binds to regulate the operon.
- **Structural Genes**: These are the genes that encode the enzymes.

3. **Structural Genes of the Lac Operon**: The lac operon contains three main structural genes:
- **lacZ**: Encodes beta-galactosidase, which breaks down lactose into glucose and galactose.
- **lacY**: Encodes permease, which facilitates the entry of lactose into the cell.
- **lacA**: Encodes transacetylase, which is involved in the metabolism of lactose.

4. **Identifying the Gene for Transacetylase**: The question specifically asks about the enzyme transacetylase. This enzyme is produced from the structural gene **lacA**.

5. **Conclusion**: Therefore, the correct answer to the question is that transacetylase is coded by the gene **lacA**.

### Final Answer:
Transacetylase is produced by the lac operon from the structural gene **lacA**.