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. zwitterionic form

Explanation

To answer the question, "An amino acid under certain conditions has both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Amino Acids**: Amino acids are organic compounds that contain both an amino group (-NH2) and a carboxyl group (-COOH). These functional groups can gain or lose protons (H+ ions) depending on the pH of the environment.

2. **Charge States of Amino Acids**:
- In acidic conditions (low pH), the amino group can accept a proton (H+), resulting in a positively charged ion (cation).
- In basic conditions (high pH), the carboxyl group can lose a proton, resulting in a negatively charged ion (anion).

3. **Simultaneous Charges**: Under certain conditions, particularly at a specific pH known as the isoelectric point, an amino acid can exist in a form where it has both a positive charge (from the amino group) and a negative charge (from the carboxyl group) at the same time.

4. **Definition of Zwitterion**: The form of the amino acid that has both positive and negative charges simultaneously is called a **zwitterion**. A zwitterion is a neutral molecule overall but contains both cationic (positive) and anionic (negative) charges.

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

### Final Answer:
The correct answer is **zwitterionic form**.