Question

The graph showing the concept of activation energy of enzyme is given below. Observe the graph and choose the correct option for M and N.

 

• A. M-High temperature, High activation energy, N-Low temperature, Low activation energy
• B. M-High substrate, High activation energy, N-Low substrate, Low activation energy
• C. M-Activation energy without enzyme, N-Activation energy with enzyme
• D. M-Activation energy with enzyme, N-Activation energy without enzyme

Hint:

Enzymes reduce activation energy, lowering the energy barrier for reactions.

Answer 1

The Correct Option is C

• Graph Analysis: The graph depicts two energy curves. The higher curve (M) represents the energy barrier without a catalyst (enzyme), while the lower curve (N) shows a reduced energy barrier with an enzyme.
• Activation Energy Concept: Activation energy is the energy required to reach the transition state. Enzymes lower this energy, as shown by the difference between M and N.
• Option Analysis:
  • (1) M-High temperature, High activation energy, N-Low temperature, Low activation energy: Temperature affects reaction rate, not directly the activation energy curves shown. Incorrect.
  • (2) M-High substrate, High activation energy, N-Low substrate, Low activation energy: Substrate concentration influences rate, not the energy barrier itself. Incorrect.
  • (3) M-Activation energy without enzyme, N-Activation energy with enzyme: Matches the graph, where M is the higher barrier (no enzyme) and N is the lower barrier (with enzyme). Correct.
  • (4) M-Activation energy with enzyme, N-Activation energy without enzyme: Reverses the graph interpretation. Incorrect.
• Conclusion: The correct option is (3), as M represents the activation energy without an enzyme, and N represents the reduced activation energy with an enzyme.