Mention the functional group of amino acids involved in the formation of a peptide bond.

Explanation

To answer the question about the functional groups of amino acids involved in the formation of a peptide bond, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Amino Acids**:
- Amino acids have a basic structure that includes an amino group (NH2), a carboxyl group (COOH), a hydrogen atom, and a variable R group (side chain).

2. **Understand Peptide Bond Formation**:
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