An amino acid under certain conditions have both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called

Options

A. acidic form
B. basic form
C. aromatic form
D. Zwitterion

Explanation

To answer the question about the form of an amino acid that has both positive and negative charges simultaneously, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding Amino Acids**:
- Amino acids are the building blocks of proteins. Each amino acid has a central carbon atom (alpha carbon) to which an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a unique side chain (R group) are attached.

2. **Amino Acid Structure**:
- The general structure of an amino acid can be represented as:
```
H
|
NH2-C-COOH
|
R
```
- Here, the amino group can accept a proton (H+) and the carboxyl group can donate a proton.

3. **Conditions for Zwitterion Formation**:
- At a neutral pH (around 7), amino acids can exist in a form where the amino group is protonated (NH3+) and the carboxyl group is deprotonated (COO-). This results in the amino acid having both a positive charge (from the amino group) and a negative charge (from the carboxyl group).

4. **Definition of Zwitterion**:
- The form of the amino acid that contains both positive and negative charges is known as a **zwitterion**. This is a dipolar ion, meaning it has no net charge but has regions of positive and negative charge.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the form of the amino acid with both positive and negative charges simultaneously is called a **zwitterion**.

### Final Answer:
The form of amino acid that has both positive and negative charges simultaneously is called a **zwitterion**.

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