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

Gram-positive bacteria retain which color after Gram staining?

AGreenBBlackCPinkDPurple

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

The answer and the reasoning

D. Purple

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

Option by option

A. Green
Green may have another clinical role but is not supported by this clue.
B. Black
Black is inconsistent with the requested mechanism or identification.
C. Pink
Pink does not fit the stated bacteriology relationship.
D. Purple (correct)
Correct. Purple matches the decisive principle in this item.

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.

Questions about this Microbiology question

What is the answer to this Microbiology question?

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

Why is "Green" not the answer?

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

Why is "Black" not the answer?

Black is inconsistent with the requested mechanism or identification.

Why is "Pink" not the answer?

Pink does not fit the stated bacteriology relationship.

What concept does this question test?

It tests Bacteriology in Microbiology. The correct option holds because: Correct. Purple 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.