Biology Biomolecules NUMS 2023
PMDC Verified Question 40 of 142
Thermal stability of organisms in the environment is because of which characteristics of water?
A
Solvent property
B
Ionization
C
Heat capacity
D
Protection
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Heat capacity
Concept:

Because living organisms are roughly 70% water, their internal temperature is deeply linked to the thermal properties of water itself.

Solution:

  • Water molecules are bound together by an extensive network of hydrogen bonds.


  • When thermal energy (heat) is applied, much of that energy is absorbed and used strictly to stretch and break these hydrogen bonds, rather than increasing the kinetic speed (temperature) of the molecules.


  • This gives water a remarkably high specific heat capacity, meaning organisms can endure massive fluctuations in environmental heat without experiencing dangerous spikes in their own internal body temperature.


Why other options are incorrect:

  • Solvent property & Ionization: Govern cellular chemical reactions and pH, not thermal resistance.


  • Protection: A vague term (water does provide mechanical cushioning like CSF, but thermal stability is strictly a thermodynamic "heat capacity" function).

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.

Previous Question All Biomolecules MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App