Write the different components of a lac - operon in E . Coli Explain its expression while in an 'open' state.

Explanation

### Step-by-Step Solution:

1. **Components of the Lac Operon**:
- The lac operon in *E. coli* consists of several key components:
- **Structural Genes**: These include three genes:
- **lacZ**: Encodes β-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.
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