Question:
Why is tryptophan called an essential amino acid?
Why is tryptophan called an essential amino acid?
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Essential amino acids are those the body cannot make and must be obtained from food.
Updated On: Nov 12, 2026
- It contains an aromatic nucleus.
- It cannot be synthesized by the human body.
- It is a constituent of some enzymes.
- It is a neutral amino acid.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Amino acids are grouped as essential and non-essential, depending on whether the body can make them.
Step 2: Meaning of Essential
Essential amino acids must come from the diet because the human body cannot synthesise them.
Step 3: Apply to Tryptophan
Tryptophan cannot be made by the body, so it is essential. Option (B).
Final Answer:
Tryptophan is essential because the body cannot synthesise it. \[ \boxed{\text{(B) }\text{It cannot be synthesized by the human body.}} \]
Amino acids are grouped as essential and non-essential, depending on whether the body can make them.
Step 2: Meaning of Essential
Essential amino acids must come from the diet because the human body cannot synthesise them.
Step 3: Apply to Tryptophan
Tryptophan cannot be made by the body, so it is essential. Option (B).
Final Answer:
Tryptophan is essential because the body cannot synthesise it. \[ \boxed{\text{(B) }\text{It cannot be synthesized by the human body.}} \]
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