In Hartnup's disease _______ is excreted in the urine?
Correct answer: C. Tryptophan
- A. Ornithine
- B. Glutamine
- C. Tryptophan
- D. Phenylalanine
Explanation
Hartnup disease impairs intestinal and renal transport of neutral amino acids, especially tryptophan, so tryptophan is lost in urine. Its deficiency can produce pellagra-like symptoms because tryptophan contributes to niacin synthesis.
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