Which reaction is fast and has K_eq= 1?

Question

Quizplus · Accepted Answer

Looking at the kinetic parameters KS, kcat and KM, we can see that the value of KS is the same for all three reactions. This means that the substrate binding affinity is the same for all three reactions. Next, we can look at the kcat/KM ratio, which indicates how efficiently the enzyme converts substrate into product. The higher the value, the more efficient the enzyme. For reaction A, kcat/KM = 1.5 x 10^4 M^-1s^-1. For reaction B, kcat/KM = 6 x 10^5 M^-1s^-1. For reaction C, kcat/KM = 1.5 x 10^5 M^-1s^-1. Therefore, reaction B has the highest kcat/KM ratio and is the most efficient. It also has a _eq= 1, indicating a fast reaction. Hence, the best choice is B.

Which Reaction Is Fast and Has Keq = 1

Which Reaction Is Fast and Has K_eq= 1