Helper T cells are distinguished by secretion of cytokines which includes which

Question

Helper T cells are distinguished by secretion of cytokines which includes which of the following? A. Gamma interferon B. Interleukins C. Chemokines D. All of the above What process occurs during development of the immune system that removes lymphocytes that might attack the body's own cells? A. Autoantigen elimination B. Clonal deletion C. Clonal expansion D. All of the above Human chromosome 6 contains a cluster of genes important to immunity called: A) major histocompatability complex B) human leukocyte antigens C) interferon receptors D) cluster of differentiation What type of molecule is used to present foreign antigens on the surface of almost all nucleated cells A) Major Histocompatability Complex I B) Major Histocompatability Complex II C) Major Histocompatability Complex III D) None of the above

Explanation / Answer

45.b. Helper T cells secrete interleukins.

46.b.Clonal deletion is the removal through apoptosis of B cells and T cells that have expressed receptors for self before developing into fully immunocompetent lymphocytes.

47.b. The human leukocyte antigen (HLA) system or complex is a gene complex encoding the major histocompatibility complex (MHC) proteins in humans. These cell-surface proteins are responsible for the regulation of the immune system in humans. The HLA gene complex resides on a 3 Mbp stretch within chromosome 6p21.

48.a. MHC class I molecules are one of two primary classes of major histocompatibility complex (MHC) molecules and are found on the cell surface of all nucleated cells in the bodies of jawed vertebrates.

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