Question

The graph below shows the reaction rates of four different chemical reactions.

A reaction that is catalyzed by an enzyme usually absorbs less energy and is faster than normal reactions.

Which of the reactions was most likely catalyzed by an enzyme?
A.
Reaction A
B.
Reaction B
C.
Reaction D
D.
Reaction C

Answer 1

Option B

Step-by-step explanation:

The energy represented in the graph is the energy required as activation energy for initiating any chemical reaction. Thus, higher is the peak of energy absorbed, higher is the activation energy and hence lower are the chances of chemical reaction catalyzed by an enzyme. With this understanding, the reaction with lowest peak requires the least energy for initiating the chemical reaction and hence it is facilitated by the presence of an enzyme.

Hence, option B is correct

Answer 2

An enzyme would lower the activation energy required for the reaction, so A and B could be an example of a reaction without (A) and with (B) an enzyme.

D also looks like it doesn't absorb much energy so could also be an example of an enzymatic chemical reaction. But it looks slow compared to A and B.

So the answer is just B.