For an enzyme reaction where velocity (V) is plotted against substrate concentration (S), the portion of the curve where V is proportional to S is considered to be
A) the Vmax.
B) zero order.
C) first order.
D) enzyme limiting.
E) useless for studying enzyme reactions.

Question

Quizplus · Accepted Answer

The portion of the curve where V is directly proportional to S is the first order of reaction. This means that the rate of reaction increases directly with substrate concentration. This is a characteristic of enzymes with a Michaelis-Menten kinetic profile. Therefore, the correct answer is C.

For an Enzyme Reaction Where Velocity (V) Is Plotted Against