Which ones have repeated genes

Options

A. tRNA
B. Actin
C. snRNA
D. RNA polymerase.

Answer

To determine which of the given options has repeated genes, we can analyze each option based on their characteristics and functions.

### Step-by-Step Solution:

1. **Understanding Repeated Genes**:
- Repeated genes refer to sequences in the genome that occur multiple times. They are important for various biological functions, including the formation of pseudogenes and the production of multiple copies of certain gene products.

2. **Analyzing the Options**:
- **Option A: tRNA (Transfer RNA)**:
- tRNA is responsible for bringing amino acids to the ribosome during protein synthesis. However, tRNA genes are not typically classified as repeated genes in the context of this question.
- **Conclusion**: Incorrect option.

- **Option B: Actin**:
- Actin is a protein that forms part of the cytoskeleton in eukaryotic cells. While there are multiple actin genes, they do not represent repeated genes in the context of this question.
- **Conclusion**: Incorrect option.

- **Option C: snRNA (Small Nuclear RNA)**:
- snRNA is involved in the splicing of pre-mRNA in the nucleus. It is known to have repeated genes, as there are multiple copies of snRNA genes in the genome.
- **Conclusion**: Correct option.

- **Option D: RNA Polymerase**:
- RNA polymerase is an enzyme that synthesizes RNA from a DNA template. It does not have repeated genes associated with it.
- **Conclusion**: Incorrect option.

3. **Final Answer**:
- The correct answer is **C: snRNA**, as it is the only option that contains repeated genes.