Q. The stage of ornithine cycle at which arginase enzyme is used?
A) Ornithine $\rightarrow$citrulline
B) Arginine $\rightarrow$ornithine
C) Citrulline $\rightarrow$arginosuccinic acid
D) Ornithine $\rightarrow$urea
Explanation
The enzyme arginase cleaves arginine to form urea and ornithine. The urea is transported to kidneys for excretion. Urea is synthesized in liver through ornithine cycle, which was discovered by Hans Krebs and Kurt Henseleit (1932).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.