Regulated unit of genetic material is called

Options

A. Operator gene
B. regulator gene
C. operon
D. promoter gene

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the "regulated unit of genetic material." This refers to a specific structure within DNA that controls the expression of genes.

2. **Identifying Key Terms**: The options provided in the question include:
- Operator gene
- Regulated gene
- Operon
- Promoter gene

3. **Defining the Operon**: An operon is defined as a cluster of related genes that are regulated together. This means that the genes within an operon are expressed as a single unit, allowing for coordinated regulation.

4. **Components of an Operon**: An operon typically consists of:
- **Promoter**: The region where RNA polymerase binds to initiate transcription.
- **Operator**: A segment of DNA that a repressor can bind to, blocking RNA polymerase and preventing transcription.
- **Structural Genes**: The genes that are co-regulated and usually encode proteins with related functions.

5. **Example of an Operon**: A well-known example is the lac operon in E. coli, which contains three structural genes (Z, Y, and A) that code for proteins involved in lactose metabolism. These genes are regulated together, demonstrating the concept of an operon.

6. **Conclusion**: Therefore, the correct answer to the question "Regulated unit of genetic material is called" is **Operon**.

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