Chemistry Macromolecules / Biochemistry ETEA 2019
PMDC Verified Question 38 of 47
The enzyme which is found in saliva, accelerates the conversion of starch into sugar is;
A
Ptyalin
B
Pepsin
C
Thrombin
D
Fumarase
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Ptyalin
Concept:

Digestion begins in the oral cavity where specific enzymes target complex carbohydrates.

Formula:

$$ \text{Starch} \xrightarrow{\text{Ptyalin}} \text{Maltose} $$

Solution:

  • Saliva contains an enzyme called salivary amylase, historically and specifically referred to as ptyalin.
  • Ptyalin accelerates the breakdown of the polysaccharide starch into simpler sugars (like maltose and dextrins).


Why other options are incorrect:

Pepsin is a protease found in the stomach that digests proteins. Thrombin is involved in blood clotting. Fumarase is an enzyme in the Krebs cycle. None of these act on starch in the saliva.

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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