HMX Immunology Test 2 Questions with 100% Correct Answers | Latest Version 2024 | Verified

T-cell receptors, when coexpressed with CDS mole cules, are restricted to recognizing and binding peptide fragments associated with A. CD3 molecules. B. CD4 molecules. C. MHC class I molecules. D. MHC class II molecules. E. MHC class Ill molecules. - The correct answer is C. cos+ T cells are re stricted to the recognition of pMHC I complexes. C03 molecules are associated with the TCR on the T-cell surface and are found on both mature C04+ and cos+ T cells. C04+ T cells are restricted to the recognition of pMHC class II complexes. MHC class Ill molecules include complement components C4, Bf, and C2 and are not involved in T-cell recognition. B lymphocytes synthesize and express immunoglobulin A. containing multiple epitope specificities. B. in cytoplasmic phagosomes. C. in membrane complexes also containing CD3. D. on their cell membrane surface. E. only after leaving the bone marrow. - The correct answer is D. B cells synthesize and express immunoglobulin on their cell surfaces. Immunoglobulins within an individual B cell contain specificity for one epitope, not several. Cytoplasmic phagosomes are involved in degradation of unwanted materials. Membrane complexes also containing C03 are T-cell receptors (TCR) on the surfaces of T cells. B cells express surface lgM before leaving the bone marrow. The primary lymphoid organs are those in which A. adaptive immune responses are usually initiated. B. filtration devices remove foreign matter.