Question

What is the starting point of the ornithine cycle?

• A. Ornithine amino acid
• B. Citrulline amino acid
• C. Arginine
• D. Fumeric acid

Answer 1

Answer:

A. Ornithine amino acid

• 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.