Question

Which one of the following immune system components does not correctly match with its respective role?

• A. Interferons — Secreted by virus-infected cells and protect non-infected cells from further viral infection.
• B. Macrophages — Mucus-secreting cells that trap microbes entering into the body.
• C. B-Lymphocytes — Produce antibodies in response to pathogens into blood to fight with them.
• D. IgA — Present in colostrum in early days of lactation to protect infants from diseases.

Hint:

Macrophages engulf microbes; mucus-secreting cells trap them — don’t mix them up!

Answer 1

The Correct Option is B

Macrophages are actually phagocytic cells that engulf and digest pathogens. It is mucus-secreting epithelial cells that trap microbes. Hence, option (B) is incorrectly matched.