| The diagram illustrates energy changes in an enzyme controlled reaction. |
 |
| Which of the following represent the lowering of the activation energy? |
A) X
B) Y
C) Z
D) Z-Y
Correct Answer: D
Solution :
The energy required to initiate a reaction is known as the activation energy, Ea. The bold curve shows the uncatalysed reaction with \[\operatorname{Ea}=\]Z, whilst Y represents the Ea of the catalysed reaction (dotted curve). The Ea is thus lowered by (Z - Y).
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