What type of bonding is involved in the a-helix of proteins?

Explanation

To answer the question about the type of bonding involved in the alpha helix of proteins, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Proteins**:
- Proteins have four levels of structure: primary, secondary, tertiary, and quaternary. The alpha helix is part of the secondary structure.

2. **Define the Alpha Helix**:
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