What is a fundamental difference between the antigen receptors on B cells (BCR) and receptors on T cells (TCR)?
A. BCRs belong to the immunoglobulin superfamily while TCRs do not. B. TCRs are MHC restricted while BCRs are not. C. TCRs have the same specificity on all T cells while B cells have BCRs of only one specificity. D. BCRs bind to carbohydrates while TCRs bind to peptides.