A nucleoside on hydrolysis gives

Options

A. an aldopentose and an heterocyclic base
B. an aldopentose and an othophosphoric acid
C. a heterocyclic base and an orthophosphoric acid
D. an aldopentose, a heterocyclic base and an orhtophosphoric acid

Answer

To solve the question, "A nucleoside on hydrolysis gives," we can break down the process into clear steps:

### Step-by-Step Solution:

1. **Understanding Nucleosides**:
- A nucleoside is a structural subunit of nucleic acids (DNA and RNA) and consists of a nitrogenous base (either purine or pyrimidine) attached to a pentose sugar (ribose in RNA and deoxyribose in DNA).

2. **Components of a Nucleoside**:
- A nucleoside is formed by the combination of a nitrogen base (like adenine, guanine, cytosine, thymine, or uracil) and a pentose sugar (ribose or deoxyribose).

3. **Hydrolysis of a Nucleoside**:
- Hydrolysis involves the addition of water (H2O) to break the glycosidic bond between the nitrogen base and the sugar in the nucleoside.
- The reaction can be represented as:
\[ \text{Nucleoside} + H_2O \rightarrow \text{Nitrogen Base} + \text{Pentose Sugar} \]

4. **Products of Hydrolysis**:
- Upon hydrolysis, the nucleoside yields:
- A nitrogenous base (e.g., adenine, guanine, cytosine, thymine, or uracil).
- A pentose sugar (e.g., ribose or deoxyribose).

5. **Conclusion**:
- Therefore, the final answer to the question is that a nucleoside on hydrolysis gives a nitrogenous base and a pentose sugar.

### Final Answer:
A nucleoside on hydrolysis gives a nitrogenous base and a pentose sugar.

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