In RNA, the sugar is ..............but in DNA, it is ...............

Explanation

**Step-by-Step Solution:**

1. **Identify the Sugars in RNA and DNA**:
- In RNA (Ribonucleic Acid), the sugar present is **ribose**.
- In DNA (Deoxyribonucleic Acid), the sugar present is **deoxyribose**.

2. **Understanding the Structure of the Sugars**:
- Ribose has a hydroxyl group (-OH) attached to the second carbon atom in its sugar ring.
...