Amino acid not synthesised in human body is

Options

A. Nonessential
B. Deaminated
C. Aminated
D. Essential

Answer

To answer the question about which amino acid is not synthesized in the human body, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Amino Acids**: Amino acids are categorized into two main types: essential and non-essential amino acids. Essential amino acids cannot be synthesized by the human body and must be obtained from the diet, while non-essential amino acids can be synthesized by the body.

2. **Identify Essential Amino Acids**: There are nine essential amino acids that humans must obtain from their diet. These include:
- Leucine
- Isoleucine
- Tryptophan
- Lysine
- Methionine
- Valine
- Threonine
- Phenylalanine
- Histidine (often considered essential for infants)

3. **Review the Options Given**: The question provides four options: non-essential, deaminated, aminated, and essential. Since we are looking for the amino acids that are not synthesized in the human body, we should focus on the term "essential."

4. **Conclude the Answer**: The amino acids that are not synthesized in the human body are termed "essential amino acids." Therefore, the correct answer to the question is "essential."

### Final Answer:
The amino acid not synthesized in the human body is **essential amino acid**.

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