Question:
Which one of the following is not an essential amino acid ?
Which one of the following is not an essential amino acid ?
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A useful mnemonic to remember the ten essential amino acids is PVT TIM HALL:
- Phenylalanine, Valine, Threonine
- Tryptophan, Isoleucine, Methionine
- Histidine, Arginine, Lysine, Leucine
Note that the 'A' stands for Arginine, not Alanine.
- Phenylalanine, Valine, Threonine
- Tryptophan, Isoleucine, Methionine
- Histidine, Arginine, Lysine, Leucine
Note that the 'A' stands for Arginine, not Alanine.
Updated On: Jul 8, 2026
- Alanine
- Methionine
- Lysine
- Tryptophan
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Amino acids are the building blocks of proteins. They are categorized as essential (cannot be synthesized by the body and must be supplied in the diet) or non-essential (can be synthesized by the body from metabolic intermediates).
Step 2: Detailed Explanation:
Let us categorize the listed amino acids:
• Methionine, Lysine, and Tryptophan: These are essential amino acids that must be obtained through dietary sources like milk, eggs, or legumes.
• Alanine: A non-essential amino acid. The human body can readily synthesize alanine from pyruvate via transamination reactions.
Therefore, Alanine is not an essential amino acid.
Step 3: Final Answer
Alanine is a non-essential amino acid.
Amino acids are the building blocks of proteins. They are categorized as essential (cannot be synthesized by the body and must be supplied in the diet) or non-essential (can be synthesized by the body from metabolic intermediates).
Step 2: Detailed Explanation:
Let us categorize the listed amino acids:
• Methionine, Lysine, and Tryptophan: These are essential amino acids that must be obtained through dietary sources like milk, eggs, or legumes.
• Alanine: A non-essential amino acid. The human body can readily synthesize alanine from pyruvate via transamination reactions.
Therefore, Alanine is not an essential amino acid.
Step 3: Final Answer
Alanine is a non-essential amino acid.
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