A) Urea and urine
B) Ammonia and urea
C) Carbon dioxide and ammonia
D) Carbon dioxide and urea
Correct Answer: C
Solution :
Mammals are ureotelic organisms. In these organisms, the ammonia deposited in the mitochondria of liver cells is converted inrc urea in the Ornithine cycle or urea cycle. Hans Krebs discovered this cycle in 1932 (who late: also discovered citric acid cycle). Urea production occurrs almost exclusively in liver and passes into blood stream and then to kidneys. During excretion of this urea through kidneys, carbon dioxide is also excreted.
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