Question

Which of the following pair of amino acids are removed by the ornithine cycle?

(a) CO2 and H2O

(b) H2O and O2

(c) CO2 and urea

(d) Ammonia and CO2

This question was addressed to me in unit test.

This intriguing question originated from Urine Formation topic in chapter Excretory Products and Elimination of Biology – Class 11

Answer 1

Right answer is (d) Ammonia and CO2

For explanation I would say: CO2 and ammonia are a pair of waste substances removed from the blood during the ornithine cycle. The most abundant, harmful, and universal waste product of metabolism is CO2.