List five phenomena that result from hydrogen bonding.

Explanation

### Step-by-Step Solution

1. **Identify the Phenomenon of DNA Structure**:
- Hydrogen bonding plays a crucial role in stabilizing the double helix structure of DNA by holding the two strands together. The base pairs (adenine-thymine and guanine-cytosine) are connected through hydrogen bonds.
- **Phenomenon 1**: Holding of two strands of DNA (formation of double helix).

2. **Strengthening of Polymers**:
- In synthetic and natural polymers, hydrogen bonds contribute to the overall strength and stability of the polymer structure. For example, in nylon, hydrogen bonding occurs between the polymer chains, enhancing their mechanical properties.
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