State the difference between `alpha`-helix and `beta`-pleated sheet configuration

Explanation

### Step-by-Step Solution:

1. **Definition of Secondary Structure**:
- Both alpha-helix and beta-pleated sheet are types of secondary structures in proteins. They arise from hydrogen bonding between the backbone atoms in the polypeptide chain.

2. **Alpha-Helix Configuration**:
- The alpha-helix is a coiled structure where the peptide chains twist into a right-handed spiral.
- Hydrogen bonds form between the carbonyl oxygen of one amino acid and the amide hydrogen of another amino acid that is four residues earlier in the sequence (i.e., n and n+4).
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