What is the reaction rate in a simple enzymatic system, if the substrate concentration is much less than Km?
A) It is maximal.
B) It would be too slow to measure.
C) It would be reduced by addition of more substrate.
D) It would be uninfluenced by the addition of more substrate.
E) It is virtually proportional to substrate concentration.

Question

Quizplus · Accepted Answer

When the substrate concentration is much less than Km, the reaction rate is virtually proportional to the substrate concentration. This is because, under these conditions, the enzyme-substrate complex formation is limited by the availability of substrate, making the reaction rate depend directly on how much substrate is present.

What Is the Reaction Rate in a Simple Enzymatic System