Essay 24 - Antibodies

Essay 24 - Antibodies - Biology Essay 24 Given a limited...

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Biology Essay 24 Given a limited number of genes available to direct the synthesis of proteins, how is it that the mammalian immune system can respond to a nearly infinite number of structurally different antigens, including some that may never have appeared on this planet during the course of evolution. I. Structure Figure 43.8 A) B cell receptors and antibody molecules have the same structure i) One gene longer, heavy chain Other gene shorter, light chain i) B Cell receptor is just a transmembrane, integral protein that is expressed on the cell surface and the antibody is the protein’s secreted form (not in a membrane) B) T Cell receptor, i) and alpha and beta chain produced by two genes make its structure II. Diversity of Response Figure 43.11 A) Gene Rearrangement -leads to different sequences which lead to different structures a)after B and T cells are produced in the stem cells gene rearrangement occurs
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Essay 24 - Antibodies - Biology Essay 24 Given a limited...

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