Which of the following sugar is present in nucleic acid?

Options

A. dextrose
B. glucose
C. levulose
D. deoxyribose

Answer

To determine which sugar is present in nucleic acids, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Nucleic Acids**: Nucleic acids are polymers made up of nucleotide units. Each nucleotide consists of three components: a sugar, a phosphate group, and a nitrogenous base.

2. **Identify the Types of Nucleic Acids**: There are two main types of nucleic acids: DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid).

3. **Examine the Sugars in Nucleic Acids**:
- **DNA** contains deoxyribose as its sugar component.
- **RNA** contains ribose as its sugar component.

4. **Analyze the Options Given**:
- **X-glucose**: Not a sugar found in nucleic acids.
- **Glucose**: Not a sugar found in nucleic acids.
- **Levulose**: Not a sugar found in nucleic acids.
- **Deoxyribose**: This is the sugar found in DNA.

5. **Conclusion**: The sugar present in nucleic acids, specifically DNA, is deoxyribose.

### Final Answer:
The sugar present in nucleic acid is **deoxyribose**.

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