Answer :
Final answer:
The statement is true. Gamma haemolytic strains of bacteria produce a complete area of lysis directly underneath the colony on blood agar plates.
Explanation:
Gamma haemolytic strains of bacteria are a type of bacteria that can cause lysis or destruction of red blood cells. When these bacteria are grown on blood agar plates, they produce a complete area of lysis directly underneath the colony. This lysis can be observed by removing the bacterial colony from the plate. The lysis is caused by the production of enzymes called hemolysins, which can break down the red blood cells. This characteristic is used to classify bacteria into different types of hemolysis: alpha, beta, and gamma. Alpha hemolysis results in a partial lysis, beta hemolysis results in a complete lysis with a clear zone around the colony, and gamma hemolysis results in a complete lysis directly underneath the colony.
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