Test 4 – Immune System (Chapters 20 & 21) Name ... - Next2Eden

25) The molecules presented by MHC receptors are __________. 25) _________A. nucleic acidsB. carbohydratesC. peptidesD. proteins26) Interferons ___________. 26) _________A. help protect cells that have not yet been infected by virusesB. interfere with viral replication within cellsC. are part of the innate immune responseD. All of the above.27) In the thymus, T cells that recognize self MHC and self-antigen are _______________.27) _______A. allowed to become immunocompetent cells outside of the thymusB. not allowed to leave the thymus and they dieC. able to become helper T cellsD. then tested to see if they react to non-self antigen28) An antigenic determinant in humoral immunity is ___________. 28) __________A. a specific region on a 3 dimensional structure that is bound by an antibodyB. a protein held by a MHC moleculeC. a peptide that is recognized by T cellsD. the residual material after phagocytosis that binds to MHC molecules29) Which of the following statements regarding NK cells is a false? 29) _______A. NK cells are a type of lymphocyte.B. NK cells attack cancer cells and virus-infected body cells.C. NK cells attack cells that lack the correct surface receptors.D. NK cells are phagocytic.30) The key point(s) about T cell activation is that it __________. 30) ___________A. requires no co-stimulatory signalsB. requires antigen bindingC. involves at least two cellsD. B & C31) The white pulp found around arteries of the spleen contains large numbers of ________.31) ______A. lymphocytesB. macrophages & red blood cellsC. plateletsD. NK cells