Which of the following amino acid is neutral in nature

Options

A. 1)Glutamic acid
B. 2)Asparatic acid
C. 3)Valine
D. 4)Lysine

Answer

To determine which amino acid is neutral in nature from the given options, we can follow these steps:

### Step 1: Understand the Types of Amino Acids
Amino acids can be classified into three main categories based on their side chains:
1. **Acidic Amino Acids**: These have a side chain that can donate a proton (H+), making them negatively charged at physiological pH. Examples include aspartic acid and glutamic acid.
2. **Basic Amino Acids**: These have a side chain that can accept a proton, making them positively charged at physiological pH. Examples include lysine, histidine, and arginine.
3. **Neutral Amino Acids**: These do not have a charge at physiological pH. Examples include glycine, alanine, valine, leucine, isoleucine, phenylalanine, proline, serine, and threonine.

### Step 2: Analyze the Given Options
The options provided are:
- Option 1: Glutamic acid (acidic)
- Option 2: Aspartic acid (acidic)
- Option 3: Valine (neutral)
- Option 4: Lysine (basic)

### Step 3: Identify the Neutral Amino Acid
From the analysis:
- **Glutamic acid** and **aspartic acid** are both acidic amino acids, so they are not neutral.
- **Lysine** is a basic amino acid, so it is also not neutral.
- **Valine** is listed among the neutral amino acids.

### Conclusion
The amino acid that is neutral in nature from the given options is **Valine** (Option 3).

---