Question

Casein is digested in adults by

• A. Rennin
• B. Renin
• C. Chymotrypsin
• D. Trypsin

Answer 1

The correct option is C Chymotrypsin

Chymotrypsin is an enzyme of the hydrolase class that decomposes proteins and peptides. Chymotrypsin helps in the decomposition of food proteins in the small intestine. It is synthesized by the cells of the pancreas in the form of the proenzyme chymotrypsinogen, which is converted under the action of trypsin in the intestine into active chymotrypsin. Chymotrypsin is a proteinase in the pancreatic juice that clots milk and hydrolyzes casein and gelatin. Rennin, also called chymosin, is a protein-digesting enzyme that curdles milk by transforming caseinogen into insoluble casein; it is found only in the fourth stomach of cud-chewing animals, such as cows and young infants. Rennin is absent in adults.