Amino acids are amphoteric in nature. Explain.

Explanation

### Step-by-Step Solution:

1. **Definition of Amphoteric Nature**:
- Amphoteric substances are those that can act as both acids and bases. This means they can donate protons (H⁺ ions) and accept protons depending on the conditions of the reaction.

2. **Structure of Amino Acids**:
- Amino acids have a general structure represented as R-CH(NH₂)-COOH, where R is a variable side chain. The key functional groups in amino acids are the amino group (-NH₂) and the carboxyl group (-COOH).

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