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30 terms

Immunity

STUDY
PLAY
Select the correct definition about tissue grafts.
Isografts are between identical twins.
Fever is seldom beneficial because it speeds up the cellular metabolic rate and will not allow antigen-antibody reactions to occur.
False
Which of the following statements regarding NK cells is a false or incorrect statement?
NK cells are a type of neutrophil.
The mechanism of the "lethal hit" of cytotoxic T cells and NK cells involves a protein called perforin.
True
B cells respond to the initial antigen challenge by ________.
producing progeny cells that include plasma cells and memory cells
Antigens can be complete or incomplete.
True
Interferons ________.
interfere with viral replication within cells
Which of the following statements is incorrect or false?
Class II MHC molecules appear only on the surface of antigen-presenting cells, thymic cells, and T cells that have been activated by exposure to antigens.
Which of the statements below does not describe antigens?
Antigens only come from microbes.
The only T cells that can directly attack and kill other cells are the ________.
cytotoxic cells
Which of the following would be classified as a delayed hypersensitivity reaction?
allergic contact dermatitis
A transfusion reaction is a subacute hypersensitivity to foreign red blood cells.
True
Small molecules that bind with self-proteins to produce antigenic substances are called ________.
haptens
A given pathogen will provoke either a cell-mediated response or an antibody-mediated response but not both.
False
Select the correct statement about immunodeficiency.
The causative agent in acquired immune deficiency syndrome (AIDS) is a virus that recognizes CD4 proteins.
Complement proteins and antibodies coat a microorganism and provide binding sites, enabling macrophages and neutrophils to phagocytize the organism. This phenomenon is termed ________.
opsonization
Which of the following is characteristic of complete antigens?
reactivity with an antibody
Innate immune system defenses include ________.
phagocytosis
Some immunocompetent cells will never be called to service in our lifetime.
True
Which of the following is a part of the second line of defense against microorganisms?
phagocytes
Main antibody of both primary and secondary immune response.
IgG
Protects mucosal barriers.
IgA
Involved in allergies.
IgE
Along with IgM, this is a B cell receptor.
IgD
Activates complement.
IgM
Small proteins secreted by virus-containing cells.
interferon
Major innate mechanism that mediates destruction of foreign substances in the body.
complement
Stimulate the proliferation of other lymphocytes.
helper t cells
Dampen the activity of both T cells and B cells.
regulatory t cells
Present the double activation signal to T cells.
APCs