Biology Biomolecules UHS 2023
PMDC Verified Question 46 of 142
Which statement is true regarding both starch and cellulose?
A
They are geometric isomers of each other
B
They can both be digested by humans
C
They are both used for energy storage in plants
D
They are both polymers of glucose
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: They are both polymers of glucose
Concept:

Despite having drastically different physical structures and functions, both molecules share the exact same foundational building block.

Solution:

  • Both starch and cellulose are massive, complex polysaccharides found exclusively in plants.


  • Both are constructed 100% entirely by polymerizing thousands of single glucose monomer units.


  • The only difference is the geometric linkage: starch uses α-glucose (helical), while cellulose uses β-glucose (straight, rigid fibers).


Why other options are incorrect:

  • Digested by humans: Humans easily digest starch (amylase), but completely lack the cellulase enzyme required to digest cellulose (it passes as roughage/fiber).


  • Energy storage: Starch is for energy storage; cellulose is strictly for rigid structural support of the cell wall.


  • Geometric isomers: The monomers (α and β glucose) are isomers, but the massive polymeric structures themselves are not simply isomers of one another.

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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