Chemistry Macromolecules / Biochemistry SZABMU 2023
PMDC Verified Question 14 of 47
Enzyme is a natural substance that:
A
Has no effect on the rate of chemical reaction
B
Increases the rate of chemical reaction
C
Decreases the rate of chemical reaction
D
Stops the chemical reaction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Increases the rate of chemical reaction
Concept:

Enzymes are biological catalysts produced by living cells to facilitate biochemical reactions.

Formula:

$$ k = A e^{-\frac{E_a}{RT}} $$

Solution:

  • By providing an alternative reaction pathway with a lower activation energy (\( E_a \)), enzymes allow more substrate molecules to convert into product per unit time.
  • Therefore, they fundamentally increase the rate of chemical reaction.


Why other options are incorrect:

Enzymes do not decrease or stop reactions (that is the role of inhibitors). Since life depends on rapid metabolic processes, claiming they have "no effect" is biologically false.

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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