Biology Biomolecules SZABMU 2023
PMDC Verified Question 63 of 142
The sugar which is part of ribonucleic acid is:
A
Ribulose
B
Ribose
C
Deoxyribulose
D
Deoxyribose
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Ribose
Concept:

Nucleic acids are named directly after the pentose sugar making up their backbone.

Solution:

  • Ribonucleic acid (RNA) utilizes the standard 5-carbon sugar Ribose (\(C_5H_{10}O_5\)) in every single one of its nucleotide building blocks.


Why other options are incorrect:

  • Deoxyribose: The sugar found exclusively in DNA (missing one oxygen atom).


  • Ribulose / Deoxyribulose: These are ketose sugars; nucleic acid backbones strictly require the specific ring structure formed by aldoses.

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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