Question:
Assertion (A): With the increase in substrate concentration the velocity of enzymatic reaction reaches Vmax which is not exceeded by any further rise in substrate concentration.
Reason (R): Enzyme molecules are fewer than the substrate molecules.
Assertion (A): With the increase in substrate concentration the velocity of enzymatic reaction reaches Vmax which is not exceeded by any further rise in substrate concentration.
Reason (R): Enzyme molecules are fewer than the substrate molecules.
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When all enzymes are busy, adding more substrate doesn't help—it's like a full restaurant!
Updated On: Jun 10, 2026
- Both (A) and (R) are correct and (R) is the correct explanation to (A)
- Both (A) and (R) are correct but (R) is not correct explanation for (A)
- (A) is correct (R) is wrong
- (A) is wrong (R) is correct
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Enzyme kinetics and substrate saturation.
Step 2: Meaning
Enzyme reactions reach a maximum velocity ($V_{max}$) once all available active sites on the enzyme molecules are occupied.
Step 3: Analysis
Since the number of enzyme molecules is limited (fewer than substrate molecules in excess), further addition of substrate cannot speed up the reaction because there are no free enzymes available to catalyze it.
Step 4: Conclusion
The lack of free enzymes explains why the reaction velocity plateaus at $V_{max}$.
Final Answer: (A)
Enzyme kinetics and substrate saturation.
Step 2: Meaning
Enzyme reactions reach a maximum velocity ($V_{max}$) once all available active sites on the enzyme molecules are occupied.
Step 3: Analysis
Since the number of enzyme molecules is limited (fewer than substrate molecules in excess), further addition of substrate cannot speed up the reaction because there are no free enzymes available to catalyze it.
Step 4: Conclusion
The lack of free enzymes explains why the reaction velocity plateaus at $V_{max}$.
Final Answer: (A)
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