Exam 28: Immunity and Host Defense

Symptoms of delayed- type hypersensitivity begin to appear several hours after secondary exposure to the eliciting antigen.

Which of the following are molecular mediators of inflammation?

Vaccines can be developed from synthetic peptides.

DiGeroge's syndrome is a developmental defect that prevents the maturation of the thymus and inhibits the production of mature_________ .

Adaptive immune responses are directed at pathogen molecules called_________ .

Which of the following immunogens is MOST effective as a vaccine?

Anticoagulants promote the clotting of blood.

The macromolecules inside and on the surface of pathogens display patterns consisting of repeating subunits called __________.

T cells interact with the peptide- MHC complex using

An example of pathogen- associated molecular patterns (PAMP) is

A mutant strain of a pathogen that has lost its virulence but still retains the immunizing antigens is called_________.

After the first exposure to an antigen, a_________ stimulates growth and multiplication of antigen- reaction cells.

Superantigens bind 5- 25% of all T cells, whereas less than_________of all available T cells interact with a conventional foreign antigen in a typical immune response.

Which of these is often used as a prophylactic measure to protect a person against future attack by a pathogen?

Differentiate between T- cytotoxic (TC) cells and T- helper (TH) cells.

New vaccine strategies resulting from progress in biochemistry and molecular biology include the production of

How do phagocytes interact speedily and effectively with pathogens?

A diagnostic test for M. tuberculosis exposure uses an inflammatory reaction associated with M. tuberculosis termed_________ .

Superantigens activate more T cells than a normal immune response.

All gram- negative bacteria have lipopolysaccharides in their outer membranes.