A. B cells B. helper T cells C. microglial cells D. macrophages E. b and c A. 8.

Question

A. B cells B. helper T cells C. microglial cells D. macrophages E. b and c A. 8. C. D. secreting antibodies which attack invaders attaching to antigens on invaders and secreting antibodies attaching to antigens on invaders and secreting chemicals toxic to the invaders secreting cytokines toxic to invaders into the blood to seek out and kill invaders E. producing interferons that stop invading viruses from entering cells thre A. the antigen must be complexed with MHC I protein and presented to the cell surface B. the antigen must be complexed with MHC II protein and presented to the cel surface C. I-1 must be produced by the helper T cell D. the antigen must be complexed with MHC I protein and presented to lymphocytes A. antigens B. antibodies C cytotoxic T cells D. E. NK cells macrophages 16.-WhenAIDSdevelops A. B cells cannot perform adequately B. cytotoxic T cells cannot perform adequately C. T cells cannot perform adequately D. macrophages cannot perform adequately E. a, b, and c 17--Onedistinctio-etweenBCellsandTcellsisthat A. B cells directly attack an invader while T cells secrete antibodies that attack the invader B. Tcells produce antibodies C Tcells directly attack an invader while B cells become plasma cells that secrete antibodies that attack the invader D. both cell types attack invaders directly but some B cells differentiate into plasma cells that also simultaneously secrete antibodies 4

Explanation / Answer

12. B. Helper T cells are target cells of HIV

HIV infects Helper T cells of immune system, specifically CD4+ T cells. Because, They have more CD4 receptors on the cells

HIV also infects macrophages, astrocytes & oligodendrocytes. But CD4+ cells are main target cells

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