Which of the following statements concerning B cell receptors (BCRs) is FALSE?
A. They are formed in response to an encounter with an antigen.
B. They are complementary in shape to a specific antigenic determinant that they may or may not encounter.
C. They are bound to the surface of B lymphocytes and have two antigen-binding sites.
D. Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR.
E. Scientists estimate that each person forms at least 1011 different types of B lymphocytes with distinct BCRs.
Answer: A
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