Biology Biomolecules MDCAT 2014
PMDC Verified Question 140 of 142
The simplest monosaccharide containing keto group is:
A
Glyceraldehyde
B
Dihydroxyacetone
C
Ribose
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 B: Dihydroxyacetone
Concept:

Monosaccharides are polyhydroxy aldehydes or ketones. The simplest sugars are trioses, containing exactly three carbon atoms.

Solution:

  • There are two three-carbon sugars (trioses):


  • Glyceraldehyde: Contains an aldehyde functional group (an aldotriose).


  • Dihydroxyacetone: Contains a ketone functional group (a ketotriose).


  • Therefore, the simplest possible monosaccharide with a keto group is Dihydroxyacetone.


Why other options are incorrect:

  • Glyceraldehyde: The simplest aldo-sugar, not keto.


  • Ribose: A 5-carbon aldo-sugar.


  • Glucose: A 6-carbon aldo-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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