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Which of the following statements is true concerning antibodies?
An antibody is very specific and will only attach to one antigen. Once it does, the antibody can signal the pathogen or infected cell to be destroyed by macrophages and other phagocytic cells in the body, such as cytotoxic T-cells. The antibodies themselves cannot destroy the pathogen.
T-cells serve important functions in the communication and stimulation of antibody production, but do not actually produce antibodies.
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Which of the following statements is true about antibodies?
Antibodies are part of the adaptive immune response, which means that they are formed later in an infection. Because both recognition sites have the same structure, they are responsive to only one type of antigen. They are located on the outside of B cells, and can be released freely into the plasma by plasma cells.
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Which antibody type is able to cross the placental barrier in order to provide temporary passive immunity for the fetus?
Placental crossing is done mainly by IgG antibodies. These fast-acting antibodies provide temporary immunity for the fetus until it is able to have its own immune system produce sufficient antibody amounts.
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