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Microbiology Lab Practical Practice Exam

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A positive catalase test produces what observable result?
Correct Answer:
Bubbles
Explanation:
The test checks for the enzyme catalase by watching what happens when hydrogen peroxide is added. If catalase is present, it splits hydrogen peroxide into water and oxygen, and the released oxygen gas appears as bubbles. That rapid bubbling is the observable sign of a positive result. If catalase isn’t present, no bubbles form because the hydrogen peroxide isn’t broken down. So the observable result for a positive catalase test is bubbles.

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