In arginine cycle urea is synthesised when CO2 and NH3 combines with
(a) Arginine (b) Ornithine
(c) Citruline (d) All of the above
EXPLANATION: (b) In ornithine arginine or urea cycle, with the help of a number of enzymes and energy of ATP, two molecule of CO2 are combined with a molecule of NH3 to form urea.
(8)