There may be more Which of the bacteria (A-E) would you expect to be catalase positive...

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There may be more Which of the bacteria (A-E) would you expect to be catalase positive and why? than one of the bacteria posi

Extra: In a Gram stain one step could be omitted and still allow differentiation between Gram positive and Gram negative bact

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Answer 1

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1. The catalase test is positive for those bacteria which are aerobes and facultative anaerobes. This is because these bacteria respire using oxygen and catalase enzyme is involved in detoxification of reactive oxygen species. Hence, option A and B are correct.

2. The step that can be omitted in gram-staining is

Counter-stain by Safranine

This is due to the fact that when safranine is not used, gram -negative cells would be unstained and show no color. On the other hand, gram-positive bacteria show purple color. Therefore, we could easily differentiate between gram-positive and gram-negative bacteria.

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Answer 2

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