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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. If you order a V/Q scan for suspected pulmonary emboli - is the filling defect seen on the ventilation or perfusion side?






2. What is the region of the fallopian tube where fertilization most commonly occurs?






3. What type of anemia is the result of a deficiency in intrinsic factor?






4. To What is the diffusion rate indirectly proportional?






5. What is the term for thymic induction of T cells with high - affinity Ag receptors for self that are programmed to undergo apoptosis?






6. What myeloid disorder is characterized by increased hematocrit - blood viscosity - basophils - and eosinophils; intense pruritus; and gastric ulcers due to histamine release from basophils - increased LAP - and plethora?






7. What is the term for failure of the testes to descend into the scrotum?






8. What is the major hormone produced in the following areas of the adrenal cortex? - Zona reticularis






9. What embryonic structure forms the adult male structure? - Gubernaculum testes






10. What CNS developmental abnormality is associated with 90% of syringomyelia?






11. What is the MCC of the following endocarditis scenarios? - Following biliary infections






12. What scale has a true zero point - graded into equal increments - and also orders them?






13. What is the name of the tremor that occurs during movements and is absent while the person is at rest?






14. What is the renal compensation mechanism for acidosis?






15. There are no persistent infections with...






16. What percent of sexual abuse cases are committed by family members?






17. What occurs when the lower esophageal sphincter fails to relax during swallowing due to abnormalities of the enteric nervous plexus?






18. What is the term for the difference between systolic and diastolic pressures?






19. Name the Hgb - O2 binding site based on the following information: x Greatest affinity of the three remaining sites for attachment; requires PO2 levels of 26 mm Hg to remain attached






20. Where is the lesion that produces these symptoms when a patient is asked to look to the left? - Right eye can't look left - left eye nystagmus - and convergence is intact






21. What region of the Ig does not change with class switching?






22. Name the most common type or cause - Bronchiolitis in children






23. What are the five hormones produced by Sertoli cells?






24. What is the major Ig of the secondary immune response in the mucosal barriers?






25. When does most of the NREM sleep (stage 3 and 4) occur - in the first or second half of sleep?






26. What muscle or muscles are innervated by the following nerves? - Thoracodorsal nerve






27. Name the compartment of the mediastinum associated with the following thoracic structures: Ascending aorta






28. What cell transports IgA - is secreted by plasma cells - and is in Peyer's patches to the gastrointestinal lumen?






29. If the radius of a vessel is decreased by half - what happens to the resistance?






30. What is the term for the total percentage of correct answers selected on a screening test?






31. Which hepatitis B Ag correlates with infectivity and viral proliferation?






32. What prokaryotic positioning enzyme in translation is blocked by the following? - Streptomycin






33. What part of the heart forms x Apex?






34. What is the name of the monoclonal antibody used in the treatment of Crohn disease and rheumatoid arthritis?






35. Name the type of regeneration (i.e. - labile - stable - or permanent) based on the following examples - Liver






36. What two drugs inhibit the release of neurotransmitters from storage granules?






37. Name the hypochromic microcytic anemia based on the following laboratory values - Normal iron - TIBC - percent saturation - and ferritin






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






39. After a longstanding left - to - right shunt reverses - causing cyanosis - and becomes a right - to - left shunt - What is it termed?

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40. What subtype of IgG does not bind to staphylococcal A protein?






41. Name the macrophage based on its location: x Brain macrophages






42. Name four major risk factors for atherosclerosis.






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






44. Anatomical and alveolar dead spaces together constitute what space?






45. Which genus of dermatophytes is associated with the following sites of infection? - Hair and skin only






46. What virus produces koilocytic cells on a Papanicolaou (Pap) smear?






47. What form of estrogen is of placental origin?






48. What DNA replication enzyme breaks the hydrogen bond of base pairing - forming two replication forks?






49. How many days prior to ovulation does LH surge occur in the menstrual cycle?






50. Which dopamine receptor excites the direct pathway of the basal ganglia?