`alpha-` helix of protein is formed by the bending of polypeptide chain to form hydrogen bonds in the same chain.

Explanation

To determine whether the statement "alpha-helix of protein is formed by the bending of polypeptide chain to form hydrogen bonds in the same chain" is true or false, we can follow these steps:

### Step-by-Step Solution:

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

2. **Defining Alpha-Helix**:
...