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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. What respiratory center in the caudal pons is the center for rhythm promoting prolonged inspirations?






2. What are the five K






3. What thrombolytic agent is derived from Beta- hemolytic streptococci - is antigenic - and produces depletion of circulating fibrinogen - plasminogen - and factors V and VII?






4. What is the term for the amount of blood in the ventricle after maximal contraction?






5. What AA is the major carrier of nitrogen byproducts from most tissues in the body?






6. What has occurred to the renal arterioles based on the following changes in the GFR - RPF - FF - and glomerular capillary pressure? - GFR ? - RPF ? - FF ? - capillary pressure ?






7. What component of the inner ear x Contains perilymph and responds to angular acceleration and deceleration of the head?






8. What type of binding occurs with one Fab or one idiotype of IgG?






9. What three structures are in contact with the left colic flexure? With the right colic flexure?






10. In the elderly - what happens to total sleep time - percentage of REM sleep - and percentage of NREM sleep?






11. Name the correct artery - The right recurrent laryngeal nerve passes around it.






12. What causes a skeletal muscle contraction to terminate?






13. What subset of CD4 helper T- cell function is helping the development of CD8 T cells?






14. What is the most common chromosomal disorder?






15. During puberty - What is the main drive for the increased GH secretion?






16. Name the cancer associated with the following chemical agents. (Some may have more than one answer.) x Alkylating agents






17. What cerebral lobes are most commonly affected in herpes encephalitis?






18. At what stage of sleep is GH output elevated?






19. What AA is a precursor of the following substances? - Histamine






20. What three cephalosporins inhibit vitamin K- dependent factors?






21. What type of collagen is abnormal in patients with osteogenesis imperfecta?






22. In an adult - Where does the spinal cord terminate and What is it called?






23. When do hCG concentrations peak in pregnancy?






24. What are the five branches of the posterior cord of the brachial plexus?






25. Name the structure that enters or exits the following foramina: x Hypoglossal canal






26. Are excitatory neurotransmitters in the CNS.






27. What is the only enzyme in the body that uses N-5- methyl folate?






28. What neuroleptic agent causes agranulocytosis but does not induce tardive dyskinesia?






29. Which PG is associated with maintaining a PDA?






30. Name the most common type or cause - Erysipelas






31. What are the five conditions associated with normochromic normocytic anemia with a normal MCV and an elevated reticulocyte count?






32. What is the term for an inhibited female orgasm?






33. What type of Ag do T cells recognize?






34. What is released from the mitochondria to trigger apoptosis?






35. What enzyme catalyzes the rate - limiting step in cholesterol metabolism?






36. What lymphoma is associated with bleeding and cryoglobulin precipitation at low temperatures - headache and confusion due to hyperviscosity - IgM M- protein spike on serum electrophoresis - and Russell bodies?






37. What is the role of the negative charge on the filtering membrane of the glomerular capillaries?






38. What three carcinomas are associated with EBV?

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39. A unilateral lesion In what nucleus will produce ipsilateral paralysis of the soft palate?






40. Based on operant conditioning - What type of reinforcement is described when x Adding a stimulus stops a behavior?






41. What is the only muscle of the soft palate that is innervated by CN V3?






42. What branch of the immune system is acquired in response to an Ag?






43. Name the compartment of the lower extremity and the nerve based on its movements - Plantar flex the foot and evert the foot






44. What cell type do cromolyn and nedocromil affect for prophylactic management of asthma via blockade?






45. What wave is the cause of the following venous pulse deflections? - The rise in right atrial pressure secondary to blood filling and terminating when the tricuspid valves opens






46. What virus lies dormant in the x Sensory ganglia of S2 and S3?






47. What form of penicillin is stable in acid environments?






48. What cell of the male reproductive system produces testosterone?






49. Which hepatitis strain is a defective virus that can replicate only inside HBV- infected cells?






50. Name the components of the femoral canal - working laterally to medially.






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