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  4. In the following flowchart about protein digestion, P, Q, R and S are enzymes. Proteins xrightarrowP Proteoses and Peptones xrightarrowQ Polypeptides xrightarrowR Dipeptides xrightarrowS Amino acids The correct information of enzymes P, Q, R and S is

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Q. In the following flowchart about protein digestion, P, Q, R and S are enzymes.
Proteins $\xrightarrow{P}$ Proteoses and Peptones $\xrightarrow{Q}$
Polypeptides $\xrightarrow{R}$ Dipeptides $\xrightarrow{S}$ Amino acids
The correct information of enzymes P, Q, R and S is

NTA AbhyasNTA Abhyas 2020Digestion and Absorption

Solution:

P- pepsin produced by stomach as pepsinogen. It is activated at acidic pH. It converts proteins into proteoses and peptones. Q- Trypsin or chymotrypsin produced by pancreas as trypsinogen or chymotrypsinogen. Trypsin is activated by enterokinase from the intestine. It can convert peptones and proteoses to polypetides. R- Aminopeptidase produced intestine in an active form. R could also be carboxypeptidase produced by pancreas as procarboxypeptidase. Both of them can convert polypetides to dipeptides. In this contect it is aminopeptidase. S is dipeptidase produced by intestine in an active form. It converts dipeptides to amino acids