Acidic and basic amino acids

Explanation

### Step-by-Step Solution

1. **Understanding Amino Acids**:
- Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid has a central carbon atom (C) bonded to four different groups: a hydrogen atom (H), a carboxylic acid group (-COOH), an amino group (-NH2), and a variable side chain (R group).

2. **General Structure of Amino Acids**:
- The general structure can be represented as:
```
...