Exam 43: The Immune System

Mutant fruit flies that make only one antimicrobial peptide were tested for survival after infection with Neurospora crassa fungi or with Micrococcus luteus bacteria. -According to the graph,naive B cells will produce effector cells

Which statement best describes the difference in responses of effector B cells (plasma cells)and cytotoxic T cells?

Use the following information as background for the next few questions. Immunodeficiencies can be genetic in origin,and two examples are Bruton's agammaglobulinemia,an X-linked disorder,and DiGeorge syndrome,caused by a deletion from chromosome 22.Bruton's disorder results in underdeveloped B cells,whereas DiGeorge syndrome results in a missing or seriously underdeveloped thymus. -Select the description that likely indicates a child with Bruton's disease.

Which of the following would not help a virus avoid triggering an adaptive immune response?

Which of the following statements about epitopes are correct? I.B-cell receptors bind to epitopes. II.T-cell receptors bind to epitopes. III.There can be several different epitopes on each antigen. IV.There is a one-to-one correspondence between antigen and epitope.

The cell-mediated immunity that destroys virally infected cells involves

Several strains of the human papillomavirus (HPV)can cause cervical cancer in some women.In 2006,a vaccine against several of the cancer-causing HPV strains was released.If a mutation occurs in the virus resulting in antigenic variation,the vaccine may no longer be effective because

Engulfing-phagocytic cells of innate immunity include all of the following except

Adaptive immunity depends on

The function of antibodies is to

Within a differentiated B cell,the rearrangement of DNA sequences between variable regions and joining regions is accomplished by

The receptors on T cells and B cells bind to

Following radiation,a person's bone marrow is been destroyed.Which of the following cells are no longer produced? I.B cells II.T cells III.erythrocytes IV.lysosome

Use the following information as background for the next few questions. Immunodeficiencies can be genetic in origin,and two examples are Bruton's agammaglobulinemia,an X-linked disorder,and DiGeorge syndrome,caused by a deletion from chromosome 22.Bruton's disorder results in underdeveloped B cells,whereas DiGeorge syndrome results in a missing or seriously underdeveloped thymus. -Assume that a DiGeorge syndrome-like phenotype was produced in a specific "gene-knockout" mouse,one lacking expression of HA3,a Hox gene known to be involved in developmental regulation in the mouse. The phenotype of the HA3 knockout can be ascertained by

A newborn who is accidentally given a drug that destroys the thymus would most likely

The cells and signalling molecules that initiate inflammatory responses are

Which of the following statements is not true?

Use the following table to answer the questions below.Rh is a protein found on the surface of some people's red blood cells. -Study the table.The mother could exhibit an anti-Rh-factor reaction to the developing fetus in

A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to

Secondary immune responses upon a second exposure to a pathogen are due to the activation of