IgG is the:
a. first antibody produced when an invading microorganism is initially encountered.
b. antibody that is associated with various parasitic infections.
c. antibody that is secreted in various body fluids and primarily protects those body surfaces lined with mucous membranes.
d. second antibody produced when an in-vading microorganism is initially encoun-tered and the most abundant.
D
Each of the five different classes of antibodies has its distinctive molecular configuration and is involved in the immune reaction in a different way. IgG is the most abundant and is the second antibody produced when an invading microorganism is initially encountered.
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