Differentiate between a nucleoside and a nucleotide.

Explanation

To differentiate between a nucleoside and a nucleotide, we can break down their definitions and components:

### Step-by-Step Solution:

1. **Definition of Nucleoside**:
- A nucleoside is a molecular structure that consists of two main components: a nitrogenous base and a sugar (specifically a pentose sugar). Importantly, a nucleoside does not contain a phosphate group.

2. **Definition of Nucleotide**:
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