Biology Biomolecules ETEA 2023
PMDC Verified Question 49 of 142
Lactose is composed of:
A
Glucose + Fructose
B
Glucose + Galactose
C
Glucose + Glucose
D
Fructose + Glucose
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Glucose + Galactose
Concept:

Memorizing the constituent monosaccharides of the three primary dietary disaccharides is essential.

Solution:

  • Lactose is the primary sugar naturally found in mammalian milk.


  • It is a disaccharide synthesized by a condensation reaction linking one molecule of Glucose to one molecule of Galactose via a β-1,4-glycosidic bond.


Why other options are incorrect:

  • Glucose + Fructose: Forms Sucrose (table sugar).


  • Glucose + Glucose: Forms Maltose (malt sugar).

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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