A positive catalase test is indicated by which observation?

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Prepare effectively for the VTNE Laboratory Procedures Test with engaging flashcards and multiple-choice questions, each complemented by helpful hints and explanations. Boost your confidence and readiness for exam day!

Multiple Choice

A positive catalase test is indicated by which observation?

Explanation:
A catalase-positive result shows that the organism can break down hydrogen peroxide into water and oxygen. When hydrogen peroxide is added to a sample with active catalase, rapid oxygen gas is produced, creating visible bubbles or fizzing. This immediate effervescence signals catalase activity. If there are no bubbles, catalase is absent or inactive, even though other features like color change, gel formation, or fibrin are not related to this enzyme's action.

A catalase-positive result shows that the organism can break down hydrogen peroxide into water and oxygen. When hydrogen peroxide is added to a sample with active catalase, rapid oxygen gas is produced, creating visible bubbles or fizzing. This immediate effervescence signals catalase activity. If there are no bubbles, catalase is absent or inactive, even though other features like color change, gel formation, or fibrin are not related to this enzyme's action.

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