What type of medium is used to isolate Staphylococcus from the skin? multiple choice 1Blood agarBrain-heart infusionTryptic soy agarNutrient agar 2. What best describes hemolysis? multiple choice 2Discoloring of agar by waste productsWhite growth on red agar plateRupturing of red blood cellsFermentation of blood gases
Question
What type of medium is used to isolate Staphylococcus from the skin? multiple choice 1Blood agarBrain-heart infusionTryptic soy agarNutrient agar 2. What best describes hemolysis? multiple choice 2Discoloring of agar by waste productsWhite growth on red agar plateRupturing of red blood cellsFermentation of blood gases
Solution
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The type of medium used to isolate Staphylococcus from the skin is Blood agar. This medium is enriched with 5% sheep blood and is used to grow fastidious organisms and detect hemolytic activity. Staphylococcus aureus, for example, is known to cause beta-hemolysis, which is the complete lysis of red blood cells, resulting in a clear zone surrounding the colonies.
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Hemolysis best describes the rupturing of red blood cells. In microbiology, hemolysis is often used as a method to identify or differentiate between different species of bacteria. The degree to which the bacteria can cause hemolysis is often observed when the bacteria are grown on blood agar plates.
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