Nucleoside on hydrolysis gives

Options

A. Pentose sugar and purine base
B. Pentose sugar, phosphoric acid, purine or pyrimidine base
C. Pentose sugar and a heterocyclic base
D. Heterocyclic base and phosphoric acid

Answer

To answer the question "Nucleoside on hydrolysis gives:", we will break down the process step by step.

### Step 1: Understand what a nucleoside is
A nucleoside is a compound formed by the combination of a nitrogenous base (which can be a purine or pyrimidine) and a pentose sugar (which can be ribose or deoxyribose).

**Hint:** Remember that a nucleoside consists of two main components: a sugar and a base.

### Step 2: Hydrolysis of a nucleoside
When a nucleoside undergoes hydrolysis, it reacts with water. Hydrolysis is a chemical reaction that involves the breaking of bonds in the presence of water.

**Hint:** Hydrolysis often involves the addition of water to break chemical bonds.

### Step 3: Products of hydrolysis
During hydrolysis, the nucleoside is broken down into its constituent parts:
- The pentose sugar (ribose or deoxyribose)
- The nitrogenous base (which can be either a purine like adenine or guanine, or a pyrimidine like cytosine, thymine, or uracil)

**Hint:** Focus on the two main components that are released during hydrolysis: the sugar and the base.

### Step 4: Conclusion
Thus, upon hydrolysis, a nucleoside yields a pentose sugar and a nitrogenous base.

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