REN is a/an

Options

A. enzyme
B. suger
C. base
D. RNA

Answer

To solve the question "REN is a/an," we need to analyze the options provided: enzyme, sugar, base, and RNA.

### Step-by-Step Solution:

1. **Understanding REN**:
- REN refers to a specific gene that is involved in the coding of a protein.

2. **Identifying the Function of REN**:
- The gene REN is responsible for coding the production of an enzyme called renin. Renin plays a crucial role in regulating blood pressure by stimulating its secretion in the kidneys.

3. **Analyzing the Options**:
- **Enzyme**: While renin is an enzyme, REN itself is not an enzyme; it is the gene that codes for the enzyme.
- **Sugar**: REN is not a sugar; sugars are components of nucleic acids (DNA and RNA).
- **Base**: REN is not a nitrogenous base; bases are the building blocks of nucleic acids.
- **RNA**: REN is indeed a type of RNA because it is a gene that codes for a protein.

4. **Conclusion**:
- Based on the analysis, the correct identification of REN is that it is a type of RNA.

### Final Answer:
REN is a type of RNA.