Q.100. Match the following digestive enzymes in Column I with their respective functions in Column II.
Column I
P. Erepsin
R. Pepsin
Q. Steapsin
S. Enterokinase
Column II
(i) converts proteins to peptides
(ii) activates trypsinogen to trypsin
(iii) converts fat into fatty acid and glycerol
(iv) converts polypeptides to amino acids
(A) P-(iv), Q-(iii), R-(ii), S-(i)
(B) P-(iv), Q-(iii), R-(i), S-(ii)
(C) P-(iii), Q-(iv), R-(i), S-(ii)
(D) P-(iii), Q-(iv), R-(ii), S-(i)
Erepsin, pepsin, steapsin, and enterokinase play key roles in human digestion, breaking down proteins and fats at specific stages. This article explains the correct matching for NEET-style question Q.100, with breakdowns of all options.
Enzyme Functions
Pepsin, secreted in the stomach, converts proteins to peptides under acidic conditions. Steapsin, or pancreatic lipase, hydrolyzes fats into fatty acids and glycerol in the small intestine. Enterokinase activates trypsinogen to trypsin, initiating pancreatic protein digestion. Erepsin, a mix of intestinal peptidases, further converts polypeptides to amino acids.
Correct Answer
Option (B) P-(iv), Q-(iii), R-(i), S-(ii) matches perfectly: Erepsin (iv) polypeptides to amino acids, Steapsin (Q) (iii) fat to fatty acid and glycerol, Pepsin (R) (i) proteins to peptides, Enterokinase (S) (ii) activates trypsinogen.
Option Analysis
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(A) P-(iv), Q-(iii), R-(ii), S-(i): Wrong as pepsin does not activate trypsinogen (R-ii); enterokinase does. Pepsin handles proteins to peptides, not vice versa.
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(B) P-(iv), Q-(iii), R-(i), S-(ii): Correct, aligning each enzyme with its precise function in digestion.
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(C) P-(iii), Q-(iv), R-(i), S-(ii): Incorrect; erepsin targets peptides, not fats (iii), and steapsin does not convert polypeptides.
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(D) P-(iii), Q-(iv), R-(ii), S-(i): Flawed; erepsin is not for fats, pepsin not for activation, and functions swapped wrongly.
