The formation of a peptide bond is catalysed by the enzyme .................. .

Explanation

**Step-by-Step Solution:**

1. **Understanding Peptide Bond Formation**: A peptide bond is formed when two amino acids are joined together. This process involves the removal of a water molecule (dehydration synthesis).

2. **Identifying the Enzyme**: The enzyme that catalyzes the formation of a peptide bond in living organisms is essential for this reaction.

3. **Naming the Enzyme**: The specific enzyme responsible for catalyzing the formation of peptide bonds is called **peptidases**.

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