Antigens are large molecules, typically proteins or carbohydrates, that activate the immune system by binding to specific receptors on immune cells. This activation leads to the production of antibodies and other immune responses that help to eliminate the antigen and any potential threat it may pose. B, C, and D are not accurate descriptions of antigens.

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Antigens Are

Question 32

Multiple Choice

Antigens are

A) large molecules that activate the immune system.
B) enzymes within the body that attack invading organisms.
C) chemical barriers that surround uninfected cells.
D) cells that bind to antibodies and mark them for destruction by killer cells.

Correct Answer: