MCAT Biology Question — Antibodies | Next Step Test Prep MCAT Biology Question — Antibodies | Next Step Test Prep

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Antibodies are secreted by:

a) megakaryocytes

b) natural killer cells

c) plasma cells

d) hepatocytes

Explanation

Antibodies are secreted by B-cells, and activated B-cells secreting antibodies are called plasma cells.

A) megakaryocytes, incorrect, Megakaryocytes are the source of platelets.

B) natural killer cells, incorrect, Natural Killer cells are cytotoxic lymphocytes that can recognize stressed cells in absence of antibody or MHC presentation.

C) plasma cells, correct.

D) hepatocytes, incorrect, Hepatocytes are liver cells and do not secrete antibody.

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