A) stomach
B) duodenum
C) ileum
D) Both [b] and [c]
Correct Answer: B
Solution :
Proteins are made up of amino acids, therefore, these are broken down to amino acids during the process of digestion. Digestion of protein starts in stomach and completed in small intestine. The pancreatic juice contains proenzymes trypsinogen, chymotrypsinogen and procarboxypeptidase and enzyme elastase. \[\underset{\text{(proenzyme)}}{\mathop{\text{Trypsinogen}}}\,\xrightarrow{\text{Enterokinase}}\text{Trypsin}\] \[\text{Chymotrypsinogen}\xrightarrow{\text{Trypsin}}\text{Chymotrypsin}\] \[\text{Pro}-\,\text{carboxypeptidase}\xrightarrow{\text{Trypsin}}\text{Carboxypeptidase}\] \[\text{Proteins}\xrightarrow{\text{Trypsin}}\text{Large}\,\text{peptides}\] \[\text{Proteins}\xrightarrow{\text{Chymotrypsin}}\text{Large}\,\text{peptides}\] \[\text{Elastin}\xrightarrow{\text{Elastase}}\text{Large}\,\text{peptides}\] \[\text{Large peptides}\xrightarrow{\text{Carboxpeptidase}}\text{Dipeptides}\] \[\text{+}\,\,\text{Amino}\,\text{acids}\] The intestinal juice contains enterokinase, aminopeptidases and dipeptidases. \[\xrightarrow{\text{Amino}\,\text{peptidases}}\text{Dipeptides}\,\text{+}\,\text{Amino}\,\text{acids}\] \[\text{Dipeptides}\xrightarrow{\text{Dipeptidases}}\text{Amino}\,\text{acids}\]
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