Which of the following is a neutral amino acid ?

Options

A. Glutamine
B. Arginine
C. Valine
D. Asparagine

Answer

To determine which of the following is a neutral amino acid, follow these steps:

### Step 1: Understand the Structure of Amino Acids
Amino acids consist of a central carbon atom (C) bonded to four different groups:
- An amino group (-NH2)
- A carboxylic acid group (-COOH)
- A hydrogen atom (H)
- A variable side chain (R group) that determines the properties of the amino acid.

### Step 2: Classify Amino Acids
Amino acids can be classified based on the nature of their R groups:
- **Acidic amino acids** have R groups that can donate protons (H+).
- **Basic amino acids** have R groups that can accept protons.
- **Neutral amino acids** have R groups that are neither acidic nor basic.

### Step 3: Identify Examples of Neutral Amino Acids
Some common examples of neutral amino acids include:
- Glycine
- Alanine
- Valine
- Leucine
- Isoleucine

### Step 4: Analyze the Given Options
To find the neutral amino acid from the options provided:
- Check each option against the known classifications of amino acids.
- Identify which option corresponds to a neutral amino acid.

### Step 5: Conclusion
After analyzing the options, the neutral amino acid among the choices is **Valine** (option number 3).