Question

The given graph depicts the free energy change before, during and after a biochemical reaction. The effect of a catalytic enzyme can be described by

• A. Energy decreases at point 1
• B. Energy increases at point 1
• C. Energy decreases at point 2
• D. Energy increases at point 2
• E. Energy decreases at point 3

Answer 1

The correct option is C Energy decreases at point 2

Any chemical reaction includes the formation of transition state between reactant and product. The energy required for formation of the transition state is termed as activation energy and is represented by point 2 in the graph. Enzymes enhance the rate of reaction by lowering down the activation energy of transition state. Thus, the correct answer is option C.