BIO 2420 CH13 HW

Cell surface markers involved in immune reactions ________. are the result of genetic expression function in recognition of self molecules receive and transmit chemical messages among other cells of the system aid in cellular development All of the choices are correct.

All of the choices are correct.

Lymphocyte maturation involves ________. hormonal signals that initiate development B cells maturing in bone marrow sites T cells maturing in the thymus release of mature lymphocytes to begin migration to various lymphoid organs All of the choices are correct.

All of the choices are correct.

Lymphocytes ________. possess MHC antigens for recognizing self have membrane receptors that recognize foreign antigens gain tolerance to self by destruction of lymphocytes that could react against self develop into clones of B and T cells with extreme variations of specificity All of the choices are correct.

All of the choices are correct.

Adaptive immunity involves the response of ________. interferon B and T lymphocytes mucous membranes lysozyme skin barriers

B and T lymphocytes

What type of cells secrete antibodies? B cells Cytotoxic T cells Plasma cells Antigen-presenting cells Helper T cells

Plasma cells

The major histocompatibility complex is ________. glycoproteins, called MHC antigens, found on all body cells a set of genes that code for MHC glycoproteins found on the third chromosome located in the thymus gland All of the choices are correct.

a set of genes that code for MHC glycoproteins

Helper T cells ________. directly destroy target cells activate B cells and other T cells suppress immune reactions secrete antibodies function in allergic reactions

activate B cells and other T cells

A foreign molecule that causes an adaptive immune response is a(n) ________. marker PAMP hapten antibody antigen

antigen

Destruction of lymphocytes with self specificity is called ________. hypersensitivity proliferation clonal selection clonal deletion differentiation

clonal deletion

The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called a(n) ________. epitope hapten antigen binding site variable region None of the choices are correct.

epitope

The monomer subunit of immunoglobulin molecules has all the following except ________. disulfide bonds between polypeptide chains four antigen binding sites a variable and constant region on each polypeptide chain two identical light polypeptide chains two identical heavy polypeptide chains

four antigen binding sites

Small foreign molecules that are too small by themselves to elicit an immune response are termed ________. epitope hapten antigen binding site variable region None of the choices are correct.

hapten

Properties of effective antigens include all the following except ________. have molecular complexity are cells or large, complex molecules are large molecules with a minimum molecular weight of 1,000 are foreign to the immune system have large polymers made up of repeating subunits

have large polymers made up of repeating subunits

The progeny cells of a B-cell clone are called ________. plasma cells bursa cells sensitized T cells antibodies activated macrophages

plasma cells

Class II MHC genes code for ________. certain secreted complement components self receptors recognized by T lymphocytes all HLA antigens receptors located primarily on macrophages and B cells All of the choices are correct.

receptors located primarily on macrophages and B cells

The histocompatibility complex proteins function in ________. recognition of self antibody proliferation B-cell maturation T-cell maturation None of the choices are correct.

recognition of self

MHC molecules are found on each of the following cells except ________. red blood cells leukocytes islet of Langerhans cells epithelial cells eosinophils

red blood cells

Plasma cells ________. directly destroy target cells function in allergic reactions suppress immune reactions secrete antibodies activate B cells and other T cells

secrete antibodies

Class I MHC genes code for ________. certain secreted complement components self receptors recognized by T lymphocytes all HLA antigens receptors located primarily on macrophages and B cells All of the choices are correct.

self receptors recognized by T lymphocytes

The region of each antibody molecule where amino acid composition is highly varied from one clone of B lymphocytes to another is the ________. constant region variable region joining region hinge region light region

variable region