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.
B) an immediate rise in IgG concentrations occurs.
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________ techniques have been used to identify victims of the World Trade Center and Pentagon attacks and Thomas Jefferson's descendants.
A. Friction ridge analysis B. Carbon dating C. Hair analysis D. DNA fingerprinting
Select the incorrect statement about rheumatic fever
a. It causes a heart murmur. b. It is an autoimmune disease. c. It is triggered by a streptococcus bacterium. d. The heart conduction system is disrupted. e. The heart valves become inflamed and scarred.
The external genitalia do not become clearly differentiated until about week ________ of development.
A. 6 B. 12 C. 20 D. 38 E. 32
Fats significantly delay the emptying of the stomach through hormonal and neuronal signals
Indicate whether the statement is true or false