In the agar diffusion method of studying antimicrobial action, the ___________ is measured.
A) distance between the microbial colonies
B) turbidity of the medium
C) diameter of the individual microbial colonies
D) diameter of the zone of inhibition

Question

Quizplus · Accepted Answer

In the agar diffusion method, a disk with a known amount of an antimicrobial agent is placed on an agar plate streaked with bacteria. If the agent is effective, it will diffuse through the agar and create an area where the bacteria cannot grow, called the zone of inhibition. The diameter of this zone is measured and used to determine the effectiveness of the antimicrobial agent. Therefore, the correct answer is D, diameter of the zone of inhibition.

In the Agar Diffusion Method of Studying Antimicrobial Action, the ___________