Biology Biomolecules UHS 2022
PMDC Verified Question 79 of 142
Upon initial hydrolysis, starch yields:
A
Maltose
B
Mannose
C
Sucrose
D
Glucose
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Maltose
Concept:

Enzymatic digestion of massive polymers occurs in stepwise stages rather than instant reduction to monomers.

Solution:

  • When salivary or pancreatic amylase acts upon the massive starch polymer (amylose/amylopectin), it performs an initial, partial hydrolysis.


  • This specific enzyme cleaves the chain into two-unit fragments, yielding the disaccharide maltose.


  • Later in digestion, a separate enzyme (maltase) is required to break maltose down into final glucose monomers.


Why other options are incorrect:

  • Glucose: This is the final end-product of complete digestion, not the initial yield of amylase activity.


  • Sucrose/Mannose: Completely different sugars unrelated to starch breakdown.

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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