The amino acid from which niacin is synthesized is______________?
Correct answer: C. Tryptophan
- A. Tyrosine
- B. Theronine
- C. Tryptophan
- D. Histidine
Explanation
Tryptophan is converted to niacin through kynurenine pathway intermediates, although the conversion is relatively inefficient. Tyrosine, threonine and histidine do not serve as precursors of niacin.
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