Question

the image below shows the results of a disk diffusion assay. which antibiotics does this strain of bacteria seems to be resistant to?
e
a and c
b, d, e, and g
d and f

Explanation:

In a Disk Diffusion Assay, bacteria are resistant to an antibiotic if there is no zone of inhibition (clear area) around the antibiotic - containing disk. Looking at the image, disks A and C have no visible zone of inhibition.

Answer:

A and C