An antigen is ________, whereas an antibody is ________.

A. only on a pathogen; only in a human body
B. an immunoglobulin that is produced by lymph nodes in response to bacteria; a foreign protein that enters the body and causes an immune reaction
C. a hapten molecule that is complex in shape; an enzyme produced by the thymus gland that neutralizes antigens
D. a foreign substance such as a protein or a polysaccharide to which lymphocytes respond; a globular protein that reacts with an antigen to eliminate the antigen


Answer: D

Anatomy & Physiology

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