Which of the following statements best describes the clonal selection theory?
a. B cells differentiate into plasma cells and T cells.
b. An antibody is flexible and can change shape to bind different antigens.
c. An individual contains a single type of B cell.
d. Each B cell can produce many types of antibodies, each of which reacts with a different
antigen.
e. An individual contains many types of B cells, and each secretes only one kind of antibody.
E
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