Multiple choice

An antigen is a

  1. opposite of 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 that triggers an immune response and stimulates antibody production. Antigens are not 'opposite' to antibodies (that's backwards), nor are they residues or results of antibodies. Instead, antigens are the foreign molecules or cell-surface markers that the immune system recognizes and responds to by making specific antibodies.

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