Answer :
The clear area that forms around an antibiotic disk after incubation with a bacterial strain is called a zone of inhibition.A zone of inhibition is a clear circular area surrounding the antibiotic disk on the surface of an agar plate. It indicates the area where the bacterial growth is inhibited due to the effectiveness of the antibiotic.
An antibiotic is a type of antimicrobial medication that is used to fight bacterial infections. Antibiotics work by interfering with the metabolic processes of bacteria, which prevents them from growing and reproducing. When an antibiotic is added to a culture of bacteria, it diffuses out into the agar medium surrounding the disk. The concentration of the antibiotic is highest at the disk, and decreases as it diffuses outwards. If the concentration of the antibiotic is high enough to inhibit bacterial growth, a clear zone of inhibition will be visible on the agar surrounding the disk.
The size of the zone of inhibition can be used to determine the sensitivity of the bacterial strain to the antibiotic. Bacterial strains that are more sensitive to the antibiotic will have a larger zone of inhibition, while strains that are resistant will have a smaller or no zone of inhibition.
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