The oxidase test is used to identify bacteria of which genus, indicated by a positive reaction?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for your Microbiology exam with engaging quizzes and comprehensive questions. Review essential concepts in Clinical Laboratory Science to ensure your success. Get ready for your exam!

Multiple Choice

The oxidase test is used to identify bacteria of which genus, indicated by a positive reaction?

Explanation:
The oxidase test looks for the enzyme cytochrome c oxidase in the bacterial electron transport chain. If the organism has this enzyme, the reagent is oxidized and produces a rapid color change to dark purple within seconds. This distinguishes oxidase-positive organisms from oxidase-negative ones. Neisseria is known to be oxidase positive, which is why a positive oxidase test points to this genus. The other genera listed—Streptococcus, Bacillus, and Enterococcus—typically do not produce cytochrome c oxidase and thus yield a negative result. So a positive reaction best identifies Neisseria.

The oxidase test looks for the enzyme cytochrome c oxidase in the bacterial electron transport chain. If the organism has this enzyme, the reagent is oxidized and produces a rapid color change to dark purple within seconds. This distinguishes oxidase-positive organisms from oxidase-negative ones. Neisseria is known to be oxidase positive, which is why a positive oxidase test points to this genus. The other genera listed—Streptococcus, Bacillus, and Enterococcus—typically do not produce cytochrome c oxidase and thus yield a negative result. So a positive reaction best identifies Neisseria.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy