Biology Biomolecules SZABMU 2024 Reconduct
PMDC Verified Question 15 of 142
Stereoisomers are molecules containing atoms are:
A
Same and bonded identically
B
Same and bonded dependently
C
Dependent and bonded identically
D
Dependent and bonded same
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Same and bonded identically
Concept:

Isomerism dictates how identical molecular formulas can yield completely different biological functions based on 3D geometry.

Solution:

  • Stereoisomers (spatial isomers) are molecules that have the exact same chemical formula and are exactly bonded identically in the same sequence (e.g., C-1 is bonded to C-2, which is bonded to C-3).


  • Their only difference lies in how those identical bonds are oriented in three-dimensional space (e.g., an -OH group pointing "up" vs "down").


  • A classic biological example is α-glucose vs β-glucose.


Why other options are incorrect:

  • Structural isomers (like glucose vs fructose) are bonded differently (the double bond is on a different carbon). Stereoisomers must be bonded identically, differing only in 3D geometry. The words "dependent" in the other options represent nonsensical distractor phrasing.

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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