Exam 25: Immune Mechanisms

Phagocytes have a pathogen-recognition system known as ________ that leads to the recognition,containment,and destruction of a pathogen.

ALL antigens are immunogens.

Briefly describe how B cells are activated.

The primary function of a phagocyte is to

Some intracellular pathogens produce phagocyte-killing proteins called ________ that kill the phagocyte after ingestion of the pathogen.

Which of the following is the name of the heavy chain constant domain of an antibody?

Bacterial capsules enhance the adherence of phagocytes to bacterial cell walls,thereby promoting phagocytosis.

Antibody-mediated immunity is particularly effective against

The measurable strength of binding of antibody to antigen is called

TCRs recognize epitopes only after the immunogens have been partially degraded.

Natural killer cells like Tc cells use ________ and granzymes to kill their targets without prior exposure or contact with the foreign cells.

Briefly describe how a phagocyte engulfs and ingests a pathogen.

Th17 cells are important in the first stages of the adaptive immune response.

Which of the following is a probable lifespan of memory B cells?

In class switching in the secondary antibody response,the most common antibody switch is from

Which of the following is a function of dendritic cells?

Nonencapsulated strains of Streptococcus pneumoniae are highly virulent.

T cell-target cell interactions induce specialized Tc cells to produce ________ that kill virus-infected target cells.

Organisms such as Streptococcus pyogenes and Staphylococcus aureus that produce leukocidins are called ________ pathogens.

________ are cytotoxins produced by Tc cells that cause apoptosis.