Which type of antigens have immunologic memory and isotype switching? A: TI-1 antigens B: TI-2 antigens C: TI antigens D: TD antigens

Which of the following descriptions are correct? A: Class I MHC present endogenous antigens to CD4+ T cells B: Class I MHC present endogenous antigens to CD8+ T cells C: Class II MHC present exogenous antigens to CD4+ T cells D: Class II MHC present exogenous antigens to CD8+ T cells

MHC class II molecules can present___. A: Endogenous antigens B: Exogenous antigens C: Both A and B D: Neither A nor B

Q25 – Which proposal is correct? A: 1- ESX-1-deficient and -proficient mycobacteria impact in a similar manner the host immune system B: 2- Genetic engineering of ESX-1 secretion system in new live-attenuated vaccine candidates is feasible C: 3- The host adaptive immunity is tolerized against ESX-1-associated antigens

Each antibody binds to a particular target molecule extremely tightly, either inactivating the target directly or marking it for destruction. An antibody recognizes its target molecule— called an ________—with remarkable specificity, and, because there are potentially billions of different antigens that a person might encounter, we have to be able to produce billions of different antibodies.

Compared with normal mice, mice immunized with antigens for many times have the larger and heavier spleens because of ( ). A: proliferation of antigen specific T cells B: proliferation of antigen specific B cells C: proliferation of antigen specific T and B cells D: proliferation of antigen non-specific T and B cells

Which of the following is false? A: The theories of why immunoregulation beak-down results auto-immunity vary with the disorder. B: Streptococcal antigens cross-react with sarcolemmal heart muscle and the kidney. C: The adsorption of a foreign hapten onto an endogenous molecule doesn't lead to the formation of a hapten-carrier complex. D: SLE is an episode multisystemic disease that usually occurs in young women.