Multiple choice

An antibody is a

  1. component of blood

  2. WBC which invades bacteria

  3. secretion of mammalian RBC

  4. molecule that superficially inactivates antigen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Antibodies are glycoprotein molecules (immunoglobulins) produced by plasma cells (differentiated B lymphocytes) that bind specifically to antigens and neutralize them. They are not a blood component in themselves, not a WBC type (though they're produced by WBC derivatives), and not secreted by RBCs. Antibodies circulate in blood and lymph as part of humoral immunity.

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