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

What stain differentiates bacteria by cell-wall characteristics?

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

The answer and the reasoning

A. Gram stain

The key Bacteriology principle identifies Gram stain as the best answer because it most directly accounts for the mechanism, use, or laboratory finding described.

Option by option

  • A. Gram stain (correct)

    Correct. Gram stain matches the decisive principle in this item.

  • B. Ziehl-Neelsen stain

    Ziehl-Neelsen stain does not fit the stated bacteriology relationship.

  • C. Wright stain

    Wright stain is inconsistent with the requested mechanism or identification.

  • D. India ink

    India ink may have another clinical role but is not supported by this clue.

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 A, Gram stain. The key Bacteriology principle identifies Gram stain as the best answer because it most directly accounts for the mechanism, use, or laboratory finding described.

Why is "Ziehl-Neelsen stain" not the answer?

Ziehl-Neelsen stain does not fit the stated bacteriology relationship.

Why is "Wright stain" not the answer?

Wright stain is inconsistent with the requested mechanism or identification.

Why is "India ink" not the answer?

India ink may have another clinical role but is not supported by this clue.

What concept does this question test?

It tests Bacteriology in Microbiology. The correct option holds because: Correct. Gram stain matches the decisive principle in this item.

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.