Bacteriology: practice question

A Microbiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Microbiology · Bacteriology

Sample item

Which organism is oxidase positive and commonly causes pneumonia in cystic fibrosis?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. Pseudomonas aeruginosa

Pseudomonas aeruginosa is oxidase positive, forms biofilms, and is an important chronic airway pathogen in cystic fibrosis.

Option by option

  • A. Staphylococcus epidermidis

    S. epidermidis is skin flora.

  • B. Pseudomonas aeruginosa (correct)

    Correct: Pseudomonas is a key CF airway pathogen.

  • C. Escherichia coli

    E. coli is oxidase negative enteric flora.

  • D. Klebsiella pneumoniae

    Klebsiella has a different capsule-related pattern.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

More Microbiology questions

Questions about this Microbiology question

What is the answer to this Microbiology question?

The best answer is B, Pseudomonas aeruginosa. Pseudomonas aeruginosa is oxidase positive, forms biofilms, and is an important chronic airway pathogen in cystic fibrosis.

Why is "Staphylococcus epidermidis" not the answer?

S. epidermidis is skin flora.

Why is "Escherichia coli" not the answer?

E. coli is oxidase negative enteric flora.

Why is "Klebsiella pneumoniae" not the answer?

Klebsiella has a different capsule-related pattern.

What concept does this question test?

It tests Bacteriology in Microbiology. The correct option holds because: Correct: Pseudomonas is a key CF airway pathogen.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Bacteriology?

Make a one-line identity card for each organism: shape and stain, defining test, toxin, disease and drug. Then use the flashcards and the other Microbiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.