The difference between RNA and DNA is because of :

Options

A. sugar and base
B. sugar and phosphate
C. phosphate and base
D. sugar only

Explanation

To answer the question about the differences between RNA and DNA, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of Nucleic Acids**:
- Both RNA (Ribonucleic Acid) and DNA (Deoxyribonucleic Acid) are composed of three main components: a sugar molecule, nitrogenous bases, and a phosphate group.

2. **Examine the Sugar Component**:
- The sugar in RNA is ribose, while the sugar in DNA is deoxyribose. The presence of an additional oxygen atom in ribose distinguishes it from deoxyribose.

3. **Analyze the Nitrogenous Bases**:
- RNA contains four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and uracil (U).
- DNA also contains four nitrogenous bases, but uracil is replaced by thymine (T). Therefore, the bases in DNA are adenine (A), guanine (G), cytosine (C), and thymine (T).

4. **Consider the Phosphate Group**:
- The phosphate group is common to both RNA and DNA and does not contribute to their differences.

5. **Conclusion**:
- The differences between RNA and DNA arise from the type of sugar present (ribose in RNA vs. deoxyribose in DNA) and the types of nitrogenous bases (uracil in RNA vs. thymine in DNA). Therefore, the correct answer to the question is that the difference between RNA and DNA is because of the sugar and the bases.

### Final Answer:
The difference between RNA and DNA is because of **sugar and base**.

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