Immunology: 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 · Immunology

Sample item

What component of innate immunity can directly lyse some bacteria?

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

The answer and the reasoning

C. Complement system

Complement proteins can opsonize microbes, recruit inflammation, and form a membrane attack complex that lyses susceptible bacteria.

Option by option

  • A. Memory B cells only

    Memory B cells are adaptive immune cells, not direct innate lytic machinery.

  • B. Platelets

    Platelets primarily support hemostasis.

  • C. Complement system (correct)

    Correct: complement can form a membrane attack complex.

  • D. Erythrocytes

    Erythrocytes transport oxygen.

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 C, Complement system. Complement proteins can opsonize microbes, recruit inflammation, and form a membrane attack complex that lyses susceptible bacteria.

Why is "Memory B cells only" not the answer?

Memory B cells are adaptive immune cells, not direct innate lytic machinery.

Why is "Platelets" not the answer?

Platelets primarily support hemostasis.

Why is "Erythrocytes" not the answer?

Erythrocytes transport oxygen.

What concept does this question test?

It tests Immunology in Microbiology. The correct option holds because: Correct: complement can form a membrane attack complex.

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 Immunology?

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.