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USMLE Step 1 Prep

Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. How many acetyl CoAs per glucose enter into the TCA cycle?






2. Activates the histidine operon.






3. What are the adult remnants of the following structures? - Left umbilical vein






4. What infection is associated with ring - enhancing lesions seen on computed tomography (CT) of the brain in an HIV- positive individual?






5. What cell type is commonly elevated in asthma?






6. At which three sites in the body is T4 converted to T3?


7. What virus is associated with the Norwalk agent?






8. Name the area of the cerebral cortex with the function described: x Skill - based memory - verbal recall - balance - refined voluntary movements






9. How do the corticobulbar fibres of CN VII differ from the rest of the CNs?






10. What disorder is characterized by a depressed mood and a loss of interest or pleasure for more than 2 years?






11. What enzyme is deficient in congenital erythropoietic porphyria?






12. What is the DOC for the following protozoal infections? - Amebiasis






13. What two pathologic conditions occur when the gut does not return to the embryo?






14. The closure of what valve indicates the beginning of the isovolumetric relaxation phase of the cardiac cycle?






15. Name the compartment of the lower extremity and the nerve based on its movements - Flex the hip and extend the knee






16. What nerve is associated with the following functions? - Flex the wrist and digits - pronate the wrist and the LOAF (Lumbricales - Opponens pollicis - Abductor pollicis brevis - Flexor pollicis brevis) muscles of the hand






17. Name the most common cause - Blindness worldwide






18. What large - diameter vessel has the smallest cross - sectional area in systemic circulation?






19. What oral hypoglycemic agent stimulates pancreatic Beta- cell release of insulin and is given just prior to meals because of its short half - life?






20. Name the B- cell CD marker: x Required for class switching signals from T cells






21. Homer - Wright rosettes






22. How many pairs of spinal nerves are associated with x Coccygeal vertebrae?






23. Which bacteria are associated with the following pigment production? - Pyocyanin (blue - green)






24. What two factors result in the apex of the lung being hypoperfused?






25. What hormone disorder is characterized by the following abnormalities in sex steroids? - LH? - and FSH?? - Sex steroids - LH - FSH ?






26. What mushroom poisoning is associated with fulminant hepatitis with extensive liver necrosis?






27. Name the correct artery - The left recurrent laryngeal nerve passes around it.






28. On the venous pressure curve - What do the following waves represent? - C wave?






29. What genus is known as the smallest free living bacteria? (hint: has no cell wall and has sterols in the membrane)






30. What form of diabetes insipidus is due to an insufficient amount of ADH for the renal collecting ducts?






31. What follicular cell possesses FSH receptors and converts androgens into estradiol?






32. A patient can ______ a feeding tube.






33. What type of chromatin is transcriptionally inactive?






34. What female follicular cell is under LH stimulation and produces androgens from cholesterol?






35. Why is O2 content depressed in anemic patients?






36. At the end of each round of Beta- oxidation - What is released?






37. What ring is a weblike narrowing of the gastroesophageal junction?






38. To differentiate central from nephrogenic diabetes insipidus - after an injection of ADH - which will show a decreased urine flow?






39. What is the name of the superficial subcutaneous fascia of the abdomen containing fat?


40. What CNs are affected if there is a lesion in x The upper pons?






41. Which IL is associated with increases of IgG and IgE?






42. Name the structure that enters or exits the following foramina: x Internal auditory meatus






43. Used in the treatment of barbiturate overdose.






44. What small gram - positive - non - spore - forming rod is a facultative intracellular parasite that grows in the cold and is associated with unpasteurized milk products?






45. What is the relationship between ventilation and PCO2 levels?






46. Name the area of the cerebral cortex affected by the description of the effects - symptoms - and results of the lesion - Euphoria - delusions - thought disorders - Wernicke's aphasia - auditory hallucinations (Hint: the lesion is in the left hemisph






47. What bacterium is diagnosed using the Dieterle silver stain?






48. In What trimester is the fetus most vulnerable to congenital rubella syndrome?






49. How can you differentiate vitamin K from vitamin C deficiency by bleeding time and PT levels?






50. What happens to the resistance of the system when a resistor is added in a series?