Author: Anonymous

A patient has painless cervical lymphadenopathy, night sweats, weight loss, and a mediastinal mass. Biopsy demonstrates Reed-Sternberg cells. Which interpretation is most appropriate?

A lymphocyte with a receptor specific for one antigen encounters that antigen in a secondary lymphoid organ and rapidly produces many identical responsive cells. Which process is occurring?

A patient with polycythemia has markedly increased blood viscosity and recurrent thrombotic symptoms. The clinician determines that the patient has polycythemia vera. Which molecular abnormality best explains persistent RBC overproduction?

An influenza strain undergoes a sudden major change after genetic material from different viral strains combines. Why is this clinically important? 

 A child receives a vaccine and later produces a faster, more effective immune response when exposed to the pathogen. Which principle best explains the protection?

Which type of map projection is best for showing the correct sizes of countries and continents?

A patient undergoes a tuberculin skin test. Forty-eight hours later, the injection site is indurated and erythematous. Which immune mechanism is responsible?

A dehydrated patient has an elevated hematocrit that normalizes after fluid replacement. Which type of polycythemia is most likely?

Which sea separates Australia from New Zealand?  

Which plasma protein system can directly lyse a pathogen through a membrane attack complex?