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 immunoglobulin predominates in mucosal secretions?

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

The answer and the reasoning

D. IgA

Secretory IgA predominates in saliva, tears, breast milk, and mucosal secretions, where it helps neutralize pathogens without intense inflammation.

Option by option

  • A. IgM

    IgM is prominent early in primary humoral responses.

  • B. IgE

    IgE is associated with allergy and helminth responses.

  • C. IgG

    IgG is the most abundant serum immunoglobulin.

  • D. IgA (correct)

    Correct: IgA is the major mucosal-secretory immunoglobulin.

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 D, IgA. Secretory IgA predominates in saliva, tears, breast milk, and mucosal secretions, where it helps neutralize pathogens without intense inflammation.

Why is "IgM" not the answer?

IgM is prominent early in primary humoral responses.

Why is "IgE" not the answer?

IgE is associated with allergy and helminth responses.

Why is "IgG" not the answer?

IgG is the most abundant serum immunoglobulin.

What concept does this question test?

It tests Immunology in Microbiology. The correct option holds because: Correct: IgA is the major mucosal-secretory immunoglobulin.

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.