Which essential amino acid enhances calcium absorption and also plays an important role in the formation of collagen?

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Accepted Answer

1. Classify the options: Arginine is conditionally essential, Tyrosine is nonessential, Lysine and Histidine are essential.

2. Key roles: $	ext{Lysine}$ is known to enhance intestinal calcium absorption and its residues are hydroxylated to hydroxylysine, which is essential for collagen cross-linking (via lysyl oxidase) and overall collagen formation and stability.

3. Conclusion: the amino acid that both enhances calcium absorption and plays an important role in collagen formation is Lysine (option 3).

FINAL_ANSWER: c

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