Zwitterions are ionized species of

Options

A. Acidic amino acids
B. Basic amino acids
C. Netural amino acids
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Zwitterions**:
- Zwitterions are molecules that have both positive and negative charges but are overall electrically neutral. They contain at least one positively charged group and one negatively charged group.

2. **Identifying the Context**:
- The question asks about zwitterions in relation to amino acids. Amino acids are organic compounds that serve as the building blocks of proteins.

3. **Structure of Amino Acids**:
- The general structure of an amino acid includes a central carbon atom (C) bonded to:
- An amino group (-NH2), which is positively charged in certain conditions.
- A carboxyl group (-COOH), which can lose a proton (H+) and become negatively charged (-COO^-).
- A hydrogen atom (H).
- A variable R group (side chain) that determines the specific characteristics of each amino acid.

4. **Analyzing the Options**:
- **Option 1: Acidic Amino Acid** - These amino acids have a carboxyl group that can donate a proton, contributing to the negative charge.
- **Option 2: Basic Amino Acid** - These amino acids have an amino group that can accept a proton, contributing to the positive charge.
- **Option 3: Neutral Amino Acid** - These amino acids can also exist in zwitterionic form under physiological conditions.
- **Option 4: All of These** - Since all types of amino acids can exist as zwitterions, this option suggests that every category of amino acids can form zwitterions.

5. **Conclusion**:
- Since zwitterions can be formed by all types of amino acids (acidic, basic, and neutral), the correct answer is **Option 4: All of These**.