Biology Biomolecules UHS 2023
PMDC Verified Question 36 of 142
Energy is ____ by the breakdown of complex molecules into simpler ones, such reactions are called catabolic reactions.
A
Produced
B
Released
C
Consumed
D
Destroyed
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Released
Concept:

Metabolism is divided into energy-requiring building (anabolism) and energy-yielding breaking (catabolism).

Solution:

  • Large, complex biomolecules store significant amounts of potential chemical energy locked within their intricate covalent bonds.


  • When these molecules are broken down (catabolized) into smaller, simpler components, that locked thermodynamic energy is strictly released.


  • The cell then captures a portion of this released energy to synthesize ATP.


Why other options are incorrect:

  • Consumed: This defines anabolic reactions, which require an input of energy to build molecules.


  • Produced / Destroyed: According to the First Law of Thermodynamics, energy cannot be created (produced) or destroyed; it can only be transferred or released from one form to 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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