During the Secondary Response to Antigens Following a Previous Initial

Multiple Choice

During the secondary response to antigens following a previous initial exposure,

A) IgM molecules first appear in the bloodstream, followed by a slow rise in IgG.
B) an immediate rise in IgG concentrations occurs.
C) the antigen must first activate the appropriate B cells.
D) the antibody levels do not peak until one to two weeks after antigen exposure.
E) memory B cells do not differentiate into plasma cells.