Amino acids can be classified as `alpha-,beta-,gamma-,delta`-and so depending upon the relative position of amino group with respect to carboxyl group. Which type of amino acids form polypeptide chain in proteins?

Explanation

To answer the question regarding which type of amino acids form polypeptide chains in proteins, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Amino Acid Classification**:
- Amino acids are classified based on the position of the amino group (NH2) relative to the carboxyl group (COOH).
- The classifications include alpha (α), beta (β), gamma (γ), delta (δ), etc.

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