Which organism is oxidase positive and does not ferment glucose (glucose neither)?

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Multiple Choice

Which organism is oxidase positive and does not ferment glucose (glucose neither)?

Oxidase testing distinguishes organisms that have cytochrome c oxidase from those that don’t, while fermentation tests show whether a microbe can convert glucose to acid (and gas). An organism that is oxidase positive and does not ferment glucose must be from the nonfermenting, oxidase‑positive group. Streptococcus viridans and Yersinia are oxidase negative, so they don’t fit the oxidase criterion. Among the remaining options, Alcaligenes faecalis and Pseudomonas aeruginosa are oxidase positive and nonfermenters of glucose. The classic description for Alcaligenes faecalis fits the prompt well: it is oxidase positive and does not ferment glucose. That’s why this choice is considered correct in this context.

Oxidase testing distinguishes organisms that have cytochrome c oxidase from those that don’t, while fermentation tests show whether a microbe can convert glucose to acid (and gas). An organism that is oxidase positive and does not ferment glucose must be from the nonfermenting, oxidase‑positive group.

Streptococcus viridans and Yersinia are oxidase negative, so they don’t fit the oxidase criterion. Among the remaining options, Alcaligenes faecalis and Pseudomonas aeruginosa are oxidase positive and nonfermenters of glucose. The classic description for Alcaligenes faecalis fits the prompt well: it is oxidase positive and does not ferment glucose. That’s why this choice is considered correct in this context.

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