Chapter 21 Immunity (lecture)

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Hello everyone, This set of flashcards was created for Dr. Halls A&P class at USF in the sping of 2012. Hope it helps!

B cells respond to the initial antigen challenge by ________.
A.) producing progeny cells that include plasma cells and memory cells
B.)reducing its size
C.) forming of a large number of cells that are unlike the original B cell
D.) immediately producing antigen-specific antibodies

A.) producing progeny cells that include plasma cells and memory cells

A transfusion reaction is a subacute hypersensitivity to foreign red blood cells.

True

Innate immune system defenses include ________.
A.) plasma cells
B.) B cells
C.) phagocytosis
D.) T cells

C.) phagocytosis

Small molecules that bind with self-proteins to produce antigenic substances are called ________.
A.) haptens
B.) ions
C.) reagins
D.) antibodies

A.) haptens

Which of the following is a part of the second line of defense against microorganisms?
A.) gastric juice
B.) cilia
C.) keratin
D.) phagocytes

D.) phagocytes

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

True

Fever is seldom beneficial because it speeds up the cellular metabolic rate and will not allow antigen-antibody reactions to occur.

False

Interferons ________.
A.) act by increasing the rate of cell division
B.) interfere with viral replication within cells
C.) are routinely used in nasal sprays for the common cold
D.) are virus-specific, so that an interferon produced against one virus could not protect cells against another virus

B.) interfere with viral replication within cells

Select the correct statement about immunodeficiency.
A.) Severe combined immunodeficiency (SCID) disease is an acquired condition.
B.) Hodgkin's disease is a hereditary immunodeficiency found in children.
C.) The most common form of immunodeficiency is graft-versus-host (GVH) disease.
D.) The causative agent in acquired immune deficiency syndrome (AIDS) is a virus that recognizes CD4 proteins.

D.) The causative agent in acquired immune deficiency syndrome (AIDS) is a virus that recognizes CD4 proteins.

Which of the following would be classified as a delayed hypersensitivity reaction?
A.) allergic contact dermatitis
B.) anaphylaxis
C.) immune complex hypersensitivity
D.) cytotoxic hypersensitivity

A.) allergic contact dermatitis

Which of the statements below does not describe antigens?
A.) The parts of antigen molecules that initiate immune responses are called epitopes or antigenic determinants.
B.) Antigens exhibit immunogenicity and reactivity.
C.) Antigens can include proteins, nucleic acids, lipoproteins, glycoproteins, and certain large polysaccharides.
D.) Antigens only come from microbes.

D.) Antigens only come from microbes.

Which of the following statements regarding NK cells is a false or incorrect statement?
A.) NK cells are present in the blood, spleen, lymph nodes, and red bone marrow.
B.) NK cells are a type of neutrophil.
C.) NK cells attack cancer cells and virus-infected body cells.
D.) NK cells attack cells that display abnormal MHC antigens

B.) NK cells are a type of neutrophil.

The only T cells that can directly attack and kill other cells are the ________.
A.) plasma cells
B.) helper cells
C.) cytotoxic cells
D.) regulatory cells

C.) cytotoxic cells

Complement proteins and antibodies coat a microorganism and provide binding sites, enabling macrophages and neutrophils to phagocytize the organism. This phenomenon is termed ________.
A.) diapedesis
B.) chemotaxis
C.) opsonization
D.) agglutination

C.) opsonization

Which of the following statements is incorrect or false?
A.) Class 1 MHC molecules are built into the plasma membranes of all body cells.
B.) 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.
C.) Haptens lack immunogenicity unless attached to protein carriers.
D.) MHC proteins are the cell's identity markers

B.) Class II MHC molecules appear only on the surface of antigen-presenting cells, thymic cells, and T cells that have been activated

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

False

Antigens can be complete or incomplete.

True

Which of the following is characteristic of complete antigens?
A.) contain many repeating chemical units
B.) reactivity with an antibody
C.) inhibit production of antibodies
D.) small molecules

B.) reactivity with an antibody

Select the correct definition about tissue grafts.
A.) Xenografts are between individuals of the same species.
B.) Allografts are between different species.
C.) Autografts are between two genetically identical individuals.
D.) Isografts are between identical twins.

D.) Isografts are between identical twins.

The mechanism of the "lethal hit" of cytotoxic T cells and NK cells involves a protein called perforin.

True

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