Reaction A is the uncatalyzed reaction while Reaction B is catalyzed with enzyme Y and reaction C is catalyzed with enzyme X.
The graph of reaction A has a huge bump indicating that it requires greater activation energy. The greater the activation energy, the slower the reaction. Therefore, reaction A is an uncatalyzed reaction.
In the case of reaction B, the activation energy required lesser than A but greater than C which means that a catalyst is used but is not with the lowest activation energy. So it must have undergone a reaction with enzyme Y.
In the last case, the reaction required very less activation energy than the A and B reactions. Therefore, this reaction utilized the enzyme with the lowest activation energy which is enzyme X.
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