USMLE QBANK

The activity of which of the following enzymes is directly affected by citrate?

Which of the following structures is found only in Gram-negative microorganisms?

A scientist wishes to study free radical production under ischemic conditions. He decides to produce cerebral ischemia by tying off an artery of the brain. Ligation of which of the following arteries would be most likely to produce significant ischemic damage?

Most fascia of the body that attach to bones attach by which of the following mechanisms?

A 52-year-old woman has long-standing rheumatoid arthritis (RA) and is being treated with corticosteroids and nonsteroidal anti-inflammatory drugs (NSAIDs). Which of the following cardiac complications may arise in this clinical setting?

A 43-year-old, insulin-dependent diabetic patient is diagnosed with hypertension and begins therapy with an antihypertensive agent. Three days later, he measures his blood glucose at home and finds that it is 53 mg/dL. He recalibrates his glucose testing apparatus and repeats the test, only to find that the first reading was accurate. He is concerned that his hypoglycemia did not produce the normal premonitory signs and symptoms. Which of the following medications was most likely prescribed to treat his hypertension?

A 35-year-old woman notices a change in the appearance of a mole on her neck. Physical examination reveals that the lesion is an irregular, nodular, superficial mass with a variegated appearance. Biopsy demonstrates a primary malignant tumor. Which of the following factors is most predictive of the patient's long term prognosis?

A 33-year-old woman presents with fever, vomiting, severe irritative voiding symptoms, and pronounced costovertebral angle tenderness. Laboratory evaluation reveals leukocytosis with a left shift; blood cultures indicate bacteremia. Urinalysis shows pyuria, mild hematuria, and gram-negative bacteria. Which of the following drugs would besttreat this patient's infection?

A 55-year-old man had been in good health since receiving a heart transplant for severe atherosclerotic disease. Five years after transplantation, the patient died suddenly, without any premonitory symptoms, while working in his garden. He had been maintained on cyclosporin since his transplant. Which of the following complications would most likely be found at autopsy in the transplanted heart?

An elderly lady is brought to the emergency room after drinking insecticide that she thought was tea. After her stomach is pumped, her sense of smell is tested and it is found that she can not distinguish common smells (e.g., an orange, coffee). CT scan of the head demonstrates a mass in the olfactory groove area. The axons likely compressed by this mass project to which of the following structures?