Question

Identify the correct set(s) of essential amino acids: A. Alanine, Lysine B. Lysine, Methionine C. Threonine, Serine D. Methionine, Threonine Choose the correct answer from the options given below:

• A. A, B only \
• B. B, D only \
• C. B, C only \
• D. A, C only

Hint:

Remember the popular acronym for the 10 essential amino acids: PVT TIM HALL (Phenylalanine, Valine, Threonine, Tryptophan, Isoleucine, Methionine, Histidine, Arginine, Leucine, Lysine).

Answer 1

The Correct Option is B

Step 1: Concept Essential amino acids cannot be synthesized by the human body from metabolic intermediates. Because the body cannot produce them, they must be obtained entirely through dietary intake.

Step 2: Meaning * Essential amino acids include: Valine, Leucine, Isoleucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, and Histidine. * Non-essential amino acids can be synthesized natively by human metabolic pathways.

Step 3: Analysis * Set A: Lysine is essential, but Alanine can be synthesized from pyruvate via transamination, making it non-essential $\rightarrow$ Incorrect. * Set B: Both Lysine and Methionine are essential amino acids that must be obtained from food $\rightarrow$ Correct. * Set C: Threonine is essential, but Serine can be synthesized from 3-phosphoglycerate, making it non-essential $\rightarrow$ Incorrect. * Set D: Both Methionine and Threonine are essential amino acids $\rightarrow$ Correct.

Step 4: Conclusion Sets B and D are the only pairs made up entirely of essential amino acids. This corresponds to option B. Final Answer: (B)