Question:easy
Which from following amino acids is an essential amino acid ?
Which from following amino acids is an essential amino acid ?
Show Hint
Phenylalanine cannot be made by the body and must come from food.
Updated On: Oct 1, 2026
- Phenylalanine
- Tyrosine
- Glutamine
- Alanine
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Definition:
An amino acid is essential if the body has no pathway to make it.
Step 2: Check the options:
Phenylalanine: no pathway, essential. Tyrosine: made by hydroxylation of phenylalanine. Glutamine and alanine: made in the body from glutamate and pyruvate respectively.
Step 3: Result:
Only phenylalanine is essential.
Final Answer:
Phenylalanine is essential, option (A). \[ \boxed{\text{Phenylalanine (A)}} \]
An amino acid is essential if the body has no pathway to make it.
Step 2: Check the options:
Phenylalanine: no pathway, essential. Tyrosine: made by hydroxylation of phenylalanine. Glutamine and alanine: made in the body from glutamate and pyruvate respectively.
Step 3: Result:
Only phenylalanine is essential.
Final Answer:
Phenylalanine is essential, option (A). \[ \boxed{\text{Phenylalanine (A)}} \]
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