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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Abhijeet Gaurav
Answer is (C). Chymosin efficiently converts liquid milk to a semisolid like cottage cheese, allowing it to be retained for longer periods in the stomach. Chymosin secretion is maximal during the first few days after birth, and declines thereafter, replaced in effect by secretion of pepsin as the major gastric protease. Chymosin is secreted in the neonatal stomach of ruminants (cattle, goats, camels), pigs, cats, and rats. Animals including humans, chimps, and horses have inactivating mutations in their chymosin gene and do not secrete the enzyme.