A child has recurrent bacterial infections caused by defective phagosome function and leukocyte adhesin. Which immunodeficiency disease is most likely?  

A patient receives an allogeneic bone marrow transplant. Two weeks later the patient develops: Diffuse skin rash Jaundice Bloody diarrhea Which complication is most likely?

Most indirect-acting carcinogens are activated by which enzyme system?

A patient experiences seasonal allergic rhinitis every spring. The first exposure to pollen occurred years earlier without symptoms. Which event occurred during that initial exposure?

A patient receives an incompatible blood transfusion. The patient’s antibodies immediately bind donor red blood cells, resulting in hemolysis. This is an example of which hypersensitivity reaction?

Paraneoplastic syndromes occur in approximately what percentage of patients with malignant tumors?

Which hypersensitivity reaction is associated with deposition of immune complexes in tissues and organs. 

A patient has a lung lesion composed of mature cartilage, fat, and respiratory epithelium arranged in a disorganized fashion. The tissue types are all normally found in the lung. What is the most likely diagnosis?

A macrophage engulfs a bacterium and processes its proteins for presentation to helper T cells. Which molecule is responsible for presenting these antigens?

Which of the following characteristics is most useful for pathologists in distinguishing a benign tumor from a malignant tumor?