Amino acids have high melting points and are soluble in water.

Explanation

### Step-by-Step Solution:

1. **Understanding Amino Acids**:
Amino acids are organic compounds that serve as the building blocks of proteins. They contain both amine (-NH2) and carboxyl (-COOH) functional groups.

2. **High Melting Points**:
The high melting points of amino acids can be attributed to the presence of ionic bonds. In solid form, amino acids exist as zwitterions, which are molecules that have both positive and negative charges. The ionic attractions between these charged groups lead to a strong intermolecular force that requires a significant amount of energy to break, resulting in high melting points.

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