In a certain enzyme-catalyzed reaction the following steps occur: 1. A phosphate group on substrate A is transferred to a side chain of an active site residue of the enzyme.
2. The dephosphorylated form of substrate A dissociates from the enzyme.
3. Substrate B enters the active site and is phosphorylated with simultaneous regeneration of the enzyme in its original form.
What kind of kinetic mechanism is described?
A) random
B) sequential
C) ordered
D) ping-pong

Question

Quizplus · Accepted Answer

The described mechanism is a ping-pong mechanism, where one substrate binds and modifies the enzyme, releasing a product before the second substrate binds and is transformed, regenerating the enzyme.

In a Certain Enzyme-Catalyzed Reaction the Following Steps Occur: 1