CH 13
Plasma cells ________. A)secrete antibodies B)function in allergic reactions C)directly destroy target cells D)suppress immune reactions E)activate B cells and other T cells
A
When an antibody is covering a foreign microorganism, complement may be activated via the _______ pathway. A)classical B)interleukin C)lectin D)alternative
A
MHC molecules are found on each of the following cells except ________. A)leukocytes B)red blood cells C)epithelial cells D)eosinophils E)islet of Langerhans cells
B
The major histocompatibility complex is ________. A)glycoproteins, called MHC antigens, found on all body cells B)a set of genes that code for MHC glycoproteins C)found on the third chromosome D)located in the thymus gland E)All of the choices are correct.
B
Class II MHC genes code for ________. A)certain secreted complement components B)self receptors recognized by T lymphocytes C)all HLA antigens D)receptors located primarily on macrophages and B cellsCorrect E)All of the choices are correct.
D
Gamma-delta T cells ________. A)are considered a bridge between nonspecific and specific immune responses B)have T cell-receptors that target a wide range of antigens C)can bind to, and become activated by PAMPs D)differentiate into memory cells E)All of the choices are true.Correct
E
After secreting antibodies during an immune response, plasma cells then differentiate into memory cells. Group starts True/False
False
The third line of defense can be summarized in four stages; I—antigen binding to T helper cells, II—antigen binding to B cells, III—phagocytosis of antigen by B and T lymphocytes, IV—killing of antigen. Group starts True/False
False
Activation of B cells occurs when antigen binds to B-cell surface immunoglobulin receptors. Group starts True/False
True
Antibody molecules circulate in lymph, blood, and tissue fluids. Group starts True/False
True
One plasma cell will secrete antibodies of various classes but the antibodies will all have the same specificity. Group starts true/False
True
In addition to dendritic cells and macrophages, B cells can also act as antigen-presenting cells. This occurs when ________. A)the antigen binds to the B cell and after processing, it is presented to the dendritic cells and macrophages B)the antigen is a molecule with a simple, repeating structure and evokes an immune response as a T-cell-independent antigen C)the B cell engulfs the antigen and presents it to the T cytotoxic cell D)the B cell engulfs the antigen and presents it to the T helper cell
B
Helper T cells ________. A)directly destroy target cells B)secrete antibodies C)suppress immune reactions D)function in allergic reactions E)activate B cells and other T cells
E
Which of the following is not a property of B cells? A)Produce plasma cells and memory cells B)Mature in the bone marrow C)Low numbers circulating in the blood D)Receptors called immunoglobins E)Require antigen presented with MHC proteins
E
The diversity and specificity of the lymphocyte repertoire against any potential antigen it may encounter is due to the rearrangement of gene segments that code for the antigen receptors. Group starts True/False
True
