The amino acids which are not synthesized in the body are called :

Options

A. non essential
B. essential
C. deaminated
D. all of them

Answer

To answer the question "The amino acids which are not synthesized in the body are called:", we need to analyze the definitions of different types of amino acids.

### Step-by-Step Solution:

1. **Understanding Amino Acids**:
- Amino acids are the building blocks of proteins. They combine in various sequences to form proteins that perform numerous functions in the body.

2. **Categorization of Amino Acids**:
- Amino acids can be categorized into three main types: essential, non-essential, and semi-essential (or conditionally essential).

3. **Essential Amino Acids**:
- Essential amino acids are those that cannot be synthesized by the body. This means that they must be obtained from the diet. Examples include histidine, lysine, tryptophan, phenylalanine, methionine, threonine, leucine, isoleucine, and valine.

4. **Non-Essential Amino Acids**:
- Non-essential amino acids are those that can be synthesized by the body. Therefore, they do not need to be obtained from the diet. Examples include glutamic acid, aspartic acid, alanine, proline, and cysteine.

5. **Semi-Essential Amino Acids**:
- Semi-essential amino acids are those that are usually synthesized by the body but may need to be obtained from the diet under certain conditions (e.g., during illness or in children). Examples include arginine, tyrosine, cysteine, glycine, and serine.

6. **Conclusion**:
- Since the question specifically asks for amino acids that are not synthesized in the body, the correct answer is **essential amino acids**.

### Final Answer:
The amino acids which are not synthesized in the body are called **essential amino acids**.

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