Immune System Which of the following is correct for CD8 T cells? CD8 T cells only recognize virus-infected cells CD8 T cells can kill individual virus-infected cells in a contact dependent fashion CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only CD8 T cells only recognize virus-infected cells CD8 T cells can kill individual virus-infected cells in a contact dependent fashion CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only ANSWER DOWNLOAD EXAMIANS APP
Immune System Which is not an antigen-presenting cell (or APC)? Dendritic cell Polymorphonuclear leukocyte (or PMN) B cell All of these Dendritic cell Polymorphonuclear leukocyte (or PMN) B cell All of these ANSWER DOWNLOAD EXAMIANS APP
Immune System Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated? By the combination of different heavy and light chains that form the antigen binding site By rearrangements of the DNA encoding the variable regions of the heavy and light chains Antibody proteins can physically change their shape to bind different epitopes Both (a) and (b) By the combination of different heavy and light chains that form the antigen binding site By rearrangements of the DNA encoding the variable regions of the heavy and light chains Antibody proteins can physically change their shape to bind different epitopes Both (a) and (b) ANSWER DOWNLOAD EXAMIANS APP
Immune System Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is interleukin CD8 actin HLA interleukin CD8 actin HLA ANSWER DOWNLOAD EXAMIANS APP
Immune System T cell receptors (or TCR) on CD4+ T cells recognize peptides not associated with MHC molecules recognize peptides associated with MHC class II molecules are secreted out into the environment to bind antigens recognize peptides associated with MHC class I molecules recognize peptides not associated with MHC molecules recognize peptides associated with MHC class II molecules are secreted out into the environment to bind antigens recognize peptides associated with MHC class I molecules ANSWER DOWNLOAD EXAMIANS APP
Immune System The role of the M cell is to they use their cilia to propel mucus out of the small intestine trap virus in mucus and prevent entry induce apoptosis in virus-infected small intestinal epithelia cells pass bacteria or virus to underlying macrophages for processing and presentation of antigen they use their cilia to propel mucus out of the small intestine trap virus in mucus and prevent entry induce apoptosis in virus-infected small intestinal epithelia cells pass bacteria or virus to underlying macrophages for processing and presentation of antigen ANSWER DOWNLOAD EXAMIANS APP
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