Biology Enzymes NUMS 2022
PMDC Verified Question 50 of 79
Which enzyme works in alkaline pH?
A
Pepsin
B
Pancreatic lipase
C
Sucrase
D
Enterokinase
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Pancreatic lipase
Concept:

The digestive tract has different pH zones to compartmentalize digestion. The stomach is acidic, while the small intestine is highly basic.

Solution:

  • Pancreatic lipase is secreted by the pancreas directly into the duodenum of the small intestine.
  • The small intestine's environment is heavily buffered with bicarbonate to achieve a pH of around 9.0.
  • Therefore, pancreatic lipase has evolved to function perfectly in this highly alkaline medium.


Why other options are incorrect:

Pepsin works in the stomach's extreme acid (pH 2). Sucrase works in a mildly acidic environment (pH 4.5). Enterokinase is also intestinal but Pancreatic Lipase is the classic textbook example of a high alkaline optimum enzyme (pH 9).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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