Describe the structure of operon.

Explanation

### Step-by-Step Solution:

1. **Definition of Operon**:
An operon is defined as a unit of gene expression and regulation. It is a functional unit that consists of a cluster of genes under the control of a single promoter.

2. **Components of an Operon**:
The operon structure includes:
- **Structural Genes**: These are the genes that code for proteins. In an operon, there can be multiple structural genes that are transcribed together.
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