quiz

Immunoglobulins that are most abundant and are responsible for resistance against many viruses, bacteria, and bacterial toxins are A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.

D) IgG.

The only antibodies that normally cross the placenta are A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.

D) IgG.

________ is the class of antibody first secreted in response to a new antigen. A) IgG B) IgE C) IgD D) IgM E) IgA

D) IgM

Immunity that is genetically determined and present at birth is called ________ immunity. A) active B) natural passive C) passive D) auto E) innate

D) auto

Adaptive defenses depend on the activities of A) monocytes. B) leukocytes. C) agranulocytes. D) erythrocytes. E) lymphocytes.

D) erythrocytes.

The various classes of immunoglobulins are differentiated on the basis of their A) asymmetry. B) antigen specificity. C) light-chain variable segments. D) heavy-chain constant segments. E) reactivity.

D) heavy-chain constant segments.

The binding of an antibody to an antigen can result in A) neutralization of the antigen. B) agglutination or precipitation. C) complement activation and opsonization. D) inflammation. E) All of the answers are correct

D) inflammation.

Suppressor T cells act to A) suppress antigens. B) erase memory T cells. C) limit antigen proliferation. D) inhibit T and B cell activities. E) produce antibodies involved in autoimmunity.

D) inhibit T and B cell activities.

An inflammatory response is triggered when A) red blood cells release pyrogens. B) T cells release interferon. C) mast cells release histamine and heparin. D) neutrophils phagocytize bacteria. E) blood flow to an area increases

D) neutrophils phagocytize bacteria.

Stem cells that will form T cells develop in the A) bone marrow. B) liver. C) spleen. D) thymus. E) kidneys.

D) thymus

Immunoglobulins, formed of five subunits, that are the first antibodies to be produced in response to infection, are A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.

E) IgM.

Microphages include A) monocytes. B) Kupffer cells. C) neutrophils. D) eosinophils. E) both neutrophils and eosinophils.

E) both neutrophils and eosinophils.

The lymphatic capillaries are ________. A) more permeable than blood capillaries B) less permeable than blood capillaries C) as permeable as blood capillaries D) completely impermeable

A) more permeable than blood capillaries

Immunity that results from exposure to an antigen in the environment is called ________ immunity. A) naturally acquired active B) natural passive C) passive D) auto E) innate

A) naturally acquired active

If the disulfide bonds in IgG were broken, how many protein chains would be set free? A) 2 B) 4 C) 6 D) 8 E) dozens

B) 4

Immunoglobulins that are found on the surface of B cells and may activate antibody production are A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.

B) IgD.

Antibodies that act against a particular foreign substance are released by ________. A) T lymphocytes B) plasma cells C) lymph nodes D) medullary cords

B) plasma cells

Immunoglobulins that attach to and sensitize mast cells and basophils are A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.

C) IgE.

The classic pathway of complement activation begins when the protein C1 binds to A) the cell wall of bacteria. B) the plasma membrane of bacteria. C) an antibody attached to an antigen. D) a cell surface antigen. E) a plasma protein.

C) an antibody attached to an antigen.

Cells that help regulate the immune response are ________ cells. A) B B) plasma C) helper T D) cytotoxic T E) NK

C) helper T