Question
The protein on the surface of all nucleated cells that is used to match tissues for organ transplant purposes and is involved in determining whether a cell is infected with virus is called tissue recognition receptor Examples of a non-specific immune response or innate immune response would include intact skin, stomach acidity, the activity of our ciliated cells in the upper respiratory tract and activity of eosinophils during a parasite infection where an example of a specific immune response would be the production of immunoglobulins by activated B cells. Vaccination allows a person to develop naturally acquired passive immunity. Therefore, when a person mounts a secondary immune response upon exposure to the infectious agent (antigen), the person undergoes ____ antibody production than when the person is first exposed to the antigen from the infectious agent. Also, the response the second time is ___ time-wise. a) less vigorous: slower b)stronger: faster c)less vigorous: faster d)stronger: slower Histamine, produced in an allergy response and during inflammatory responses, causes a decrease in the permeability of capillary walls as well as ___ of blood vessels. Therefore, when person has an overwhelming allergy response they will suffer from ___ blood pressure. a)constriction: low b)dilation: low c) constriction: high d) dilation: high The lymphatic organ, the___, has a region referred to as red pulp which contains many fragile, older red blood cells which after dying are removed by macrophages in the spleen. It also ha region referred to as white pulp which contains white blood cells and filters lymph. a)tonsils b)adenoids c)spleen d)thymus Which is NOT true of immunoglobulins (antibodies)? a) among their functions is activation of complement, neutralization of viruses, bacteria & toxins b)they are composed of two identical heavy chains and two identical light chains c)there are 5 classes of antibody including IgG and IgM d)the antigen binding site consists of the free tip of the constant regions of the light and heavy i.e. the stem of the Y shaped-antibody Macrophages can act as antigen presenting cells after phagocytosing a pathogen such as a bacterium. After digesting the bacterium in the lysosome, a portion of the bacterium is presented surface in association with the macrophage molecule___. This bacterially derived mole interacts with a receptor on the surface of the T helper cell to help initiate a specific immune a) MHC class II b) leukotriene receptor c) complement receptor d) Interleukin 2 receptor e) prostaglandin receptor
Explanation / Answer
67. False. Such type of proteins are called as MHC proteins.
68.True. Neutrophils, eosiniphils and macrophages are the parts of non specific immunity.
69.b. stronger, faster
70.b (dilation, low)
71.c splen
72.d. Each tip of the "Y" of an antibody contains a paratope (analogous to a lock) that is specific for one particular epitope (similarly analogous to a key) on an antigen, allowing these two structures to bind together with precision.
73.a. MHC class II molecules are a class of major histocompatibility complex (MHC) molecules normally found only on antigen-presenting cells such as dendritic cells, mononuclear phagocytes, some endothelial cells, thymic epithelial cells, and B cells.
