A) trypsin
B) rennin
C) ptyalin
D) chymotrypsin
Correct Answer: B
Solution :
Rennin enzyme is secreted only in mammals as an inactive proenzyme called prorennin. \[HCl\] activates it into active rennin. It changes the soluble casein protein of milk into insoluble, semifluid calcium paracaseinate. This change is termed curdling of milk. Liquid milk can quickly ooze out from stomach into duodenum without being properly acted upon by pepsin. Curdling prolongs its stay in stomach so that casein may be properly splitted. Since only the young ones of mammals suck their mothers milk, rennin is probably not secreted in adults. Whether or not, it is at all secreted in man is still unkown; may be the milk we drink, or the infants suckle from their mothers breasts is simply coagulated in stomach by pepsin. Ptyalin is a carbohydrate splitting enzyme and splits carbohydrates of food into maltose. Endopeptidases are protein splitting enzymes. These include two pepsin like proteolytic enzymes, ie, trypsin and chymotrypsin. Initialy they are in their inactive precursor forms, ie, trypsinogen and chymotrypsinogen respectively.
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