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 is a common virulence factor of Streptococcus pyogenes?

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

The answer and the reasoning

A. M protein

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

Option by option

  • A. M protein (correct)

    Correct. M protein matches the decisive principle in this item.

  • B. Coagulase

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

  • C. Urease only

    Urease only does not fit the stated bacteriology relationship.

  • D. Endotoxin lipid A only

    Endotoxin lipid A only is inconsistent with the requested mechanism or identification.

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

Why is "Coagulase" not the answer?

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

Why is "Urease only" not the answer?

Urease only does not fit the stated bacteriology relationship.

Why is "Endotoxin lipid A only" not the answer?

Endotoxin lipid A only is inconsistent with the requested mechanism or identification.

What concept does this question test?

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