Define the following terms in relation to proteins :
Peptide linkage

Explanation

**Step-by-Step Solution:**

1. **Understanding Amino Acids**: Proteins are made up of building blocks called amino acids. Each amino acid has a central carbon atom, an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a variable side chain (R group).

2. **Formation of Peptide Linkage**: When two amino acids come together to form a protein, they undergo a condensation reaction. In this process, the amino group of one amino acid reacts with the carboxyl group of another amino acid.

3. **Removal of Water**: During the condensation reaction, a molecule of water (H2O) is removed. This occurs because the hydroxyl group (-OH) from the carboxyl group of one amino acid and a hydrogen atom (H) from the amino group of the other amino acid are eliminated.

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