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What is the starting point of the ornithine cycle?(a) Ornithine amino acid(b) Citrulline amino acid(c) Arginine(d) Fumeric acidI had been asked this question during an interview.My question is based upon Urine Formation topic in division Excretory Products and Elimination of Biology – Class 11

Answer»

The correct CHOICE is (a) Ornithine amino acid

The best I can explain: Ornithine amino acid is the starting point of the urea FORMATION in the Krebs-Hanseleit cycle or the urea cycle. Ornithine and CITRULLINE are the main amino acids of the urea formation.



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