The sugar unit present in the nucleotides of RNA is

Options

A. D-`beta`-ribose
B. L-`beta`-ribose
C. D-`alpha` -ribose
D. L-`alpha` -ribose

Answer

To solve the question regarding the sugar unit present in the nucleotides of RNA, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Components of RNA**:
- RNA (Ribonucleic Acid) is made up of nucleotides, which consist of three components: a nitrogenous base, a phosphate group, and a sugar.

2. **Identify the Sugar in RNA**:
- The sugar present in RNA is specifically ribose. This distinguishes RNA from DNA, which contains deoxyribose.

3. **Determine the Type of Ribose**:
- Ribose can exist in different forms, such as alpha (α) and beta (β) configurations, and can also be classified based on its stereochemistry (D or L forms).
- The common form of ribose found in RNA is D-ribose.

4. **Confirm the Correct Option**:
- Among the options given (d-beta ribose, l-beta ribose, d-alpha ribose, l-alpha ribose), the correct sugar unit present in the nucleotides of RNA is **D-beta ribose**.

5. **Final Answer**:
- Therefore, the sugar unit present in the nucleotides of RNA is **D-beta ribose**.