Multiple choice

An antigen is

  1. opposite of an antibody

  2. residue of an antibody

  3. stimulus for antibody formation

  4. result of antibody
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An antigen is any substance (typically a protein or polysaccharide) that the immune system recognizes as foreign and that triggers an immune response, specifically stimulating B cells to produce antibodies. Antigens are usually found on the surface of pathogens like bacteria and viruses. They are not 'opposite' to antibodies but rather stimulate antibody production.

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