A positive catalase test is indicated by which observation?

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Study for the VTNE Laboratory Procedures Test. Use flashcards and multiple choice questions, each question offers hints and explanations, enabling increased understanding and retention. Prepare effectively for your exam!

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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