A form of amino acid with both positive and negative charges simultaneously in the same molecule is

Options

A. Amphipathic form
B. stable form
C. zwitter ionic form
D. neutral form

Answer

To solve the question about the form of an amino acid that has both positive and negative charges simultaneously in the same molecule, 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).
- The general structure of an amino acid includes a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R group (side chain).

2. **Identifying Charges**:
- In a typical amino acid, the carboxyl group can lose a hydrogen ion (H+) and become negatively charged (-COO-).
- The amino group can gain a hydrogen ion (H+) and become positively charged (-NH3+).

3. **Zwitterionic Form**:
- When an amino acid is in a solution, it can exist in a form where the carboxyl group is negatively charged and the amino group is positively charged at the same time. This form is known as the zwitterionic form.
- The zwitterionic form is characterized by having both positive and negative charges within the same molecule, making it neutral overall.

4. **Options Analysis**:
- A. Amphiphatic form: This refers to molecules that have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, not specifically related to charges.
- B. Stable form: This is too vague and does not specifically refer to the charge characteristics of amino acids.
- C. Zwitterionic form: This is the correct answer as it describes the state where both positive and negative charges are present.
- D. Neutral form: While zwitterions are overall neutral, this term does not specifically denote the presence of both charges.

5. **Conclusion**:
- The correct answer to the question is **C. Zwitterionic form**.