Question

When Streptococci spp. are grown on agar containing blood, there are often clear zones around the colonies. This demonstrates that: OA Catalase has broken down the hydrogen peroxide resulting in a clear area with no pigment. B. Beta haemolysis has occurred. O C. Hydrogen peroxide has been produced which bleaches the red blood cells. D. Alpha haemolysis has occurred.

Answer 1

Streptococci spp are grown on agar containing blood, there are often clear zones around the colonies. This demonstrates that beta haemolysis has occurred.

Beta hemolysis is a type of haemolysis where there is a clear zone surround the colony. The enzyme secreted from the species Lyse the red blood cells. This phenomenon is called beta hemolysis.