Using the catalase test, a Staphylococcus sample would be:

Question

BlackTom AI · Accepted Answer

When evaluating what a Staphylococcus sample would show on the catalase test, we need to consider both the Gram reaction and the catalase enzyme activity distinctive to this genus.
Option 1: 'Gram (+), Catalase (-)' asserts Gram-positive status but catalase is negative. In reality, Staphylococcus species possess the catalase enzyme and readily break down hydrogen peroxide, so this combination is incorrect.
Option 2: 'Gram (-), Catalase (-)' claims the organism is Gram-negative and catalase negative. Staphylococcus is not Gram-negative; it is Gram-positive, and as noted, it is catalase positive, making this option inconsistent with Staphylococcus biology.
Option 3: 'Gram (+), Catalase (+)' states both that the organism is Gram-positive and catalase positive. This matches the well-established profile of Staphylococcus: Gram-positive cocci that produce the catalase enzyme, distinguishing them from catalase-negative, Gram-positive Streptococcus.
Option 4: 'Gram (-) Catalase (+)' describes a Gram-negative organism with catalase activity. Since Staphylococcus is Gram-positive, this option is also incorrect due to the Gram-stain mismatch, even though catalase positivity could be present in some Gram-negative bacteria too.
In summary, the key factors are the Gram reaction and catalase activity: Staphylococcus is Gram-positive and catalase-positive, so option 3 correctly aligns with both characteristics, while all other options mix one or both properties incorrectly.

Using the catalase test, a Staphylococcus sample would be:单项选择题

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