Question
Biology Question on Digestion and absorption
Gastric juice of infants contains
A
pepsinogen, lipase, rennin
B
amylase, rennin, pepsinogen
C
maltase, pepsinogen, rennin
D
nuclease, pepsinogen, lipase
Answer
pepsinogen, lipase, rennin
Explanation
Solution
The secretion of the cells of the gastric glands form gastric juice with pH 2 to 3.7. It contains two proenzymes, pepsinogen and prorennin and enzyme gastric lipase, mucous and hydrochloric acid. Rennin (chymosin) is responsible for clotting milk by acting on soluble milk protein caseinogen, and converting it into insoluble casein. This ensures that milk remains in stomach long enough to be acted on by protein digesting enzymes. Rennin's concentration is highest in young mammals (as their primary diet is milk) which reduces gradually with age.