Repeated USMLE Questions

Q- Which of the following agents reduces the blood levels of certain drugs through its action on the hepatic P450 system? A- Grapefruit juice B- Guava juice C- Kava D- St. John’s wart Q- Which of the following is the most common cause of nasal obstruction and bleeding in adolescents? A- Angiofibroma B- Nasal cancer … Read more

Q- Deficiency of the enzyme argininosuccinate in the urea cycle leads to the accumulation of which one of the following? A- Arginine B- Argininosuccinate C- Citrulline D- Ornithine Q- Epinephrine acts on which one of the following receptors to constrict vascular smooth muscle? A- α1-Adrenoceptors B- α2-Adrenoceptors C- β1-Adrenoceptors D- β2-Adrenoceptors Q- Which of the … Read more

Q- Which one of the following medications stimulates muscarinic receptors in airways when inhaled? A- Bethanechol B- Carbachol C- Methacholine D- Pilocarpine   Q- Which of the following characterizes syndrome of inappropriate antidiuretic hormone secretion? A- Euvolemic hyponatremia with continued Na excretion B- Hyperosmotic volume contraction C- Recommended treatment is desmopressin acetate and hydration D- … Read more

Q- Which one of the following medications act as bacteriostatic by inhibiting bacterial dihydrofolate reductase? A- Ciprofloxacin B- Dapsone C- Sulfamethoxazole D- Trimethoprim   Q- Which of the following statements is true about innate immunity? A- Highly specific and refined over time B- Its main components are T cells, B cells and circulating antibodies C- … Read more