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Methods in Microbiology (GATE - XL)
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Which of the following is produced by the alpha-hemolytic colonies on blood agar?
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A
Zone of partial clearing (green)
💡 Explanation:
Alpha-hemolytic colonies produce zone of partial clearing on blood agar. Alpha hemolysis is caused by hydrogen peroxide produced by the bacterium, oxidising hemoglobin to green methemoglobin.