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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.


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.


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.


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.


Small molecules that bind with self-proteins to produce antigenic substances are called ________.


A given pathogen will provoke either a cell-mediated response or an antibody-mediated response but not both.


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 ________.


Which of the following is characteristic of complete antigens?

reactivity with an antibody

Innate immune system defenses include ________.


Some immunocompetent cells will never be called to service in our lifetime.


Which of the following is a part of the second line of defense against microorganisms?


Main antibody of both primary and secondary immune response.


Protects mucosal barriers.


Involved in allergies.


Along with IgM, this is a B cell receptor.


Activates complement.


Small proteins secreted by virus-containing cells.


Major innate mechanism that mediates destruction of foreign substances in the body.


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.


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