Question

____ of ____ is compared to a standardized chart. After incubation plates are examined for clear rings (no growth) around the antimicrobial disks.

A) The diameter; zones of turbidity.
B) The thickness; zones of color change.
C) The texture; zones of biofilm formation.
D) The color; zones of mucus-like growth.

Answer 1

The diameter of zones of inhibition is compared to a standardized chart to determine the susceptibility or resistance of bacteria to antimicrobial chemicals.

Step-by-step explanation:

A) The diameter; zones of turbidity.

In the context of the question, the subject is the disk-diffusion method used to determine the effectiveness of antimicrobial chemicals against bacteria. After incubation of the bacteria on agar plates, clear rings (zones of inhibition) may form around the antimicrobial disks if they are effective. The diameter of these zones is measured and compared to a standardized chart to determine the susceptibility of the bacteria to the antibiotics.

For example, if the measured zone size is within the susceptible range on the standardized chart, it indicates that the bacteria are susceptible to the antibiotic. On the other hand, if the zone size is within the resistant range, it suggests that the bacteria are resistant to the antibiotic.

So, in summary, option A) states that the diameter of the zones of inhibition is compared to a standardized chart to determine the susceptibility or resistance of the bacteria to the antimicrobial chemicals.