Biology Enzymes UHS 2024
PMDC Verified Question 5 of 79
Induced fit model of enzyme activity suggests that an enzyme:
A
Cannot modify its active sites
B
Can bind to a single substrate
C
Can catalyze related reaction
D
Usually belong to non-regulatory enzyme
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Can catalyze related reaction
Concept:

The Induced Fit model, unlike the rigid Lock and Key model, introduces structural flexibility to the active site.

Solution:

  • Because the active site can physically mold and adapt its shape upon binding, it is not restricted to one single, perfectly identical molecule.
  • This flexibility allows the enzyme to accommodate and catalyze reactions for a class of structurally related substrates (e.g., hexokinase can phosphorylate different six-carbon sugars).


Why other options are incorrect:

Option A is the exact opposite of the Induced Fit model (which is built on modifying the active site). Option B describes the absolute rigidity of the Lock and Key model. Regulatory enzymes actually heavily rely on induced fit mechanics.

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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