Description : MHC class I proteins are present on the surface of (A) B cells only (B) T cells only (C) Macrophages only(D) All cells
Last Answer : Answer : D
Description : . MHC class I proteins would be found on___________ whereas MHC class II proteins would be found on_____________ a. Nucleated Cells; Plasma Cells b. Nucleated Cells; Macrophages c. Dendritic Cells; Neutrophils d. Only White Blood Cells; Red Blood Cells
Last Answer : b. Nucleated Cells; Macrophages
Description : MHC Class II proteins, in conjunction with antigens, are recognised by (A) Cytotoxic T cells (B) Helper T cells (C) Suppressor T cells (D) Memory T cells
Last Answer : Answer : B
Description : Which of the following statement(s) is/are true concerning the cell function of phagocytosis? a. Phagocytosis is a mechanistically distinct process of endocytosis performed by special cells to take ... known as clathrin d. Phagocytosis is performed only by white blood cells and tissue macrophages
Last Answer : Answer: a Phagocytosis is a specialized form of endocytosis by which large particles are internalized by specialized cells primarily macrophages and neutrophils. To be phagocytosed, particles ... the lumen of the thyroid follicle, thereby releasing the thyroid hormones, thyroxine triiodothyronine
Description : MHC Class III proteins include (A) Immunoglobulins (B) Components of complement system (C) T cells receptors (D) CD4 and CD8 proteins
Description : MHC class I proteins, in conjunction with antigens are recognised by (A) Cytotoxic T cells (B) Helper T cells (C) Suppressor T cells (D) Memory T cells
Last Answer : Answer : A
Description : The unique sets of proteins that present antigens on the surfaces of body cells are a. MHC proteins. b. Cytokines. c. Complement proteins. d. Immunoglobulins.
Last Answer : b. Cytokines.
Description : T cells can recognise (A) Free antigens (B) Antigens bound to cells (C) Antigens bound to antibodies (D) Antigens bound to MHC proteins
Description : The following are true : a. the HLA proteins are found within the cytoplasm of the cells b. HLA class I antigens are expressed on all cells with nuclei c. HLA class II antigens presents ... on chromosome 6 e. HLA tissue typing is carried out in all forms of transplantation to prevent rejection
Last Answer : HLA class I antigens are expressed on all cells with nuclei
Description : The initiation of a humoral immune response involves a complex interaction of the antigen, cells and intercellular messengers. Which of the following statement(s) concerning the initiation of the ... various cellular components of the immune system d. An antigen must be a living microorganism
Last Answer : Answer: a, b Stimulation of the immune system occurs after a variety of antigen-presenting cells (B lymphocytes, macrophages, dendritic cells, and Langerhans cells) act to engulf ... polysaccharides), most antigens require coordinated efforts of the various cellular components of the immune system
Description : Predominant cell types in typical chronic inflammation are all of the following EXCEPT: A A. Polymorphonuclear leukocytes B. Macrophages C. T helper lymphocytes D. NK cells
Last Answer : Polymorphonuclear leukocytes
Description : Epithelioid cells within granulomas are derived from which of the following? B A. Plasma cells B. Macrophages C. Lymphocytes D. Neutrophils
Last Answer : Macrophages
Description : Epithelioid cells within granulomas are derived from which of the following? B A. Plasma cells B. Macrophages C. Lymphocytes D. None of these
Description : Early granulation tissue is BEST characterized by the presence of: C A. Plasma cells and macrophages B. T lymphocytes and eosinophils C. Capillary buds and fibroblasts D. None of these
Last Answer : Capillary buds and fibroblast
Description : The most active phagocytic white blood cells are (a) eosinophils and lymphocytes (b) neutrophils and monocytes (c) neutrophils and eosinophils (d) lymphocytes and macrophages.
Last Answer : (b) neutrophils and monocytes
Description : T cell receptors (or TCR) on CD4+ T cells A.recognize peptides not associated with MHC molecules B.recognize peptides associated with MHC class I molecules C.recognize peptides associated with MHC class II molecules D.are secreted out into the environment to bind antigens
Last Answer : C.recognize peptides associated with MHC class II molecules
Description : Which of the following is correct? A- All T Cells are CD4+ B- An epitope can have multiple antigens C- .T Cell receptors are generated by random assortment of gene cassettes D- .MHC Class II molecules are generated by random assortment of gene cassettes
Last Answer : .T Cell receptors are generated by random assortment of gene cassettes
Description : cell receptors (or TCR) on CD4+ T cells A-recognize peptides not associated with MHC molecules B- recognize peptides associated with MHC class I moleculesC- recognize peptides associated with MHC class II molecules D- are secreted out into the environment to bind antigens
Last Answer : recognize peptides associated with MHC class II molecules
Description : Antigens that bind directly to MHC proteins without any processing are known as _____. a. epitopes b. haptens c. superantigens d. naïve cells
Last Answer : c. superantigens
Description : MHC proteins are unique to (A) Each cell (B) Each organ (C) Each individual (D) Each species
Last Answer : Answer : C
Description : The following are true about antigen presenting cells (APC): a. Langerhan's cells are the antigen presenting cells of the epidermis b. CD8+ cells only recognize antigen presenting cells bearing ... necrosis factor alpha (TNF ) can turn endothelial cells into antigen presenting cells d. all above
Last Answer : all above
Description : In our body, antibodies are formed against pathogens in – (1) liver by RBC (2) blood by platelets (3) brain by macrophages (4) thymus by lymphocytes
Last Answer : (4) thymus by lymphocytes
Description : Reactive oxygen metabolites are produced by all the following EXCEPT: B A. Macrophages B. Lymphocytes C. Monocytes D. None of these
Last Answer : Lymphocytes
Description : Tissue macrophages are derived from which one of the following? A. Resident activated fibroblasts B. Activated B lymphocytes C. Circulating monocytes D. Platelets
Last Answer : Platelets
Description : Predominant cell types in typical chronic inflammatory reactions include all of the following EXCEPT: A A. Polymorphonuclear leukocytes B. Macrophages C. T helper lymphocytes D. None of these
Description : Which one of the following are cardinal features of granulation tissue? C A. Abundant collagen B. Proliferating macrophages and lymphocytes C. Proliferating capillaries and fibroblasts D. None of these
Last Answer : Proliferating capillaries and fibroblasts
Description : In our body, antibodies are formed against pathogens in (1) liver by RBC (2) blood by platelets (3) brain by macrophages (4) thymus by lymphocytes
Last Answer : thymus by lymphocytes
Description : With regard to interferons: a. they are produced by B lymphocytes b. IFN-gamma is produced by cells infected with virus c. IFN-gamma increases MCH class I and II expression in antigen presenting cell d. IFN-gamma is produced by fibroblasts
Last Answer : IFN-gamma is produced by cells infected with virus
Description : The following statement(s) is/are true concerning cellular defense mechanisms. a. Macrophages function solely as antigen processing cells in the initial reaction to exposure to an antigen b. Macrophages ... in only small numbers within the tissue and enter an area of infection through diapedesis
Last Answer : Answer: b, d A wide variety of cell types serve to provide host defense at several levels. Macrophages act as the initial antigen processing cell that serves to ... through diapedesis after chemotactic stimuli are excluded by macrophages, bacterial breakdown products, and complement activation
Description : A _____ is a protein receptor on the surface of macrophages, dendritic cells, and endothelial cells that allow them to recognize foreign cell markers. a. Toll-like receptor (TLR) b. pathogen-associated c. Membrane attack complex (MAC) d. Natural killer cells (NK)
Last Answer : b. pathogen-associated
Description : Macrophages are professional antigen- presenting cells. The protein molecule through whichthey present antigen in human is A- actin B- nterleukin C- HLA D- .CD8
Last Answer : .CD8
Description : TH2 cells bind to a. MHC-11/peptide complex on APC cells. b. B cell receptors. c. MHc-1/etid complex on infected cells. d. MHC-11/peptide complex on B cells.
Last Answer : d. MHC-11/peptide complex on B cells.
Description : The following are true about lymphocytes: a. T cells account for 20% of the circulating lymphocytes b. in the spleen, B cells are found in the periarteriolar areas of white pulp c. in the ... paracortical area surrounding the germinal centres. d. B cells but not T cells express surface Ig G
Last Answer : in the lymph nodes, T cells occupy the paracortical area surrounding the germinal centres
Description : All the following statements about protooncogenes are true except (A) They are present in human beings (B) They are present in healthy cells (C) Proteins encoded by them are essential (D) They are expressed only when a healthy cell has been transformed into a cancer cell
Description : Myeloma cells and lymphocytes can be fused by using (A) Calcium chloride (B) Ethidium bromide (C) Polyethylene glycol (D) DNA polymerase
Description : Monoclonal antibodies are prepared by cloning (A) Myeloma cells (B) Hybridoma cells (C) T-Lymphocytes (D) B-Lymphocytes
Description : Cell-mediated immunity is the function of (A) B lymphocytes (B) T lymphocytes (C) Plasma cells (D) Basophils
Description : Cytokines are low-molecular-weight polypeptides exerting a wide variety of biologic effects at both local and systemic levels. Which of the following statement(s) is/are true concerning the production and ... effects on the host d. Each specific cytokine is produced by a single cell type
Last Answer : Answer: c Macrophages, endothelial cells, lymphocytes, and other cells secrete a large number of different compounds, termed cytokines, that are most probably evolved for the purpose of ... host defenses, exerting both salutatory and deleterious effects on the host, has become increasingly evident
Description : Receptors for thyroid hormones are present (A) On the cell membrane (B) Across the cell membrane (C) Inside the cells (D) In association with G-proteins
Description : CD 3 complex and p 56lck proteins are present in (A) Cytotoxic T cells (B) Helper T cells (C) Both (A) and (B) (D) None of these
Description : Which of the following statement(s) is/are true concerning ischemia reperfusion injury? a. During ischemia, ATP degradation results in increased plasma and intracellular levels of ... immunization with antibodies to neutrophil adhesive complex lessen the ischemic/reperfusion microvascular injury
Last Answer : Answer: a, b, c, d During the ischemia and hypoperfusion phase, degradation of ATP stores essential to maintain cell integrity and significant loss of diffusible ... either the neutrophil adhesive complex or the endothelial selectins dramatically lessens ischemia/reperfusion microvascular injury
Description : The cells that are directly concerned with phagocytosis of foreign bodies in the reticuloendothelial system are (a) reticular cells (b) monocytes (c) eosinophils and Basophils (d) macrophages
Last Answer : Ans:(b)
Description : In case of infection, following is the first line of defense B A. Antibodies B. Macrophages C. Red blood cells D. Platelets
Description : In case of infection, following is the first line of defense B A. Antibodies B. Macrophages C. Red blood cells D. Platelet
Description : The following are true about atherosclerosis: C A. it often occurs in the heart chamber B. foamy macrophages are not seen in the lesion C. smooth muscle cells proliferation in the intima of vessel D. no deposition of lipid occurs in wall of blood vessel
Last Answer : smooth muscle cells proliferation in the intima of vessel
Description : Heart failure cells, i.e.. macrophages loaded with haemosiderin, are most likely found in C A. Ascites fluid in congestive heart failure B. Pulmonary alveoli in mitral stenosis C. Left ventricular myocardium following infarction and reperfusion D. None of these
Last Answer : Ascites fluid in congestive heart failure B. Pulmonary alveoli in mitral stenosis C. Left ventricul
Description : Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the new born infants because it contains (a) immunoglobulin A (b) natural killer cells (c) monocytes (d) macrophages.
Last Answer : (a) immunoglobulin A
Description : Immunosuppressive agents used in preventing transplant rejection primarily affect a. macrophages. b. neutrophils. c. dendritic cells. d. T cells.
Last Answer : d. T cells.
Description : In the body's immune system, _____ are the major producers of secreted antibodies. a. macrophages b. plasma cells c. T cells d. B cells
Last Answer : b. plasma cells
Description : TH1 cells activate a. B cells. b. Killing of pathogens in macrophages. c. Cytotoxic T cells. d. Humoral immunity.
Last Answer : d. Humoral immunity