試題詳解

47. The clonal selection theory is an explanation for
(A)how a single type of stem cell can produce both red blood cells and white blood cells.
(B)how antibody proteins can be molded to fit antigens after the antigen interacts with the antibody-producing type of cell.
(C)how an antigen can induce the multiplication of B cells to result in production of high levels of specific antibodies.
(D) how HIV can disrupt the immune system.
(E) how macrophages can recognize specific T cells and B cells.