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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 type of scheduled reinforcement states that after a desired response - the reinforcement is given x After a set number of responses?






2. What sphingolipid is formed by the union of serine and palmitoyl CoA?






3. Are antineoplastic agents that work on actively proliferating cells schedule or dose dependent?






4. Most sleep time is spent In what stage of sleep?






5. What is the karyotype in Turner syndrome?






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






7. What are the three benzodiazepines that do not undergo microsomal oxidation?






8. What are the five branches of the superior mesenteric artery?






9. What is the term to describe the increased rate of secretion of adrenal androgens at the onset of puberty?






10. What is the name of the urinary bladder where the ureters enter and the urethra exits?






11. Can be secreted.






12. What do LMNs innervate?






13. What is the term for increased iron deposition resulting in micronodular cirrhosis - CHF - diabetes - and bronzing of the skin?






14. Name the macrophages by location: x Lungs






15. Name the lung measurement based on the following descriptions: x Maximal volume that can be expired after maximal inspiration






16. Describe the loss for each of the following in a hemisection of the spinal cord. (Brown - S






17. In MHC class II molecules - what chain blocks access to the peptide - binding groove during transportation within the cell - ensuring that the MHC class II- peptide complex is transported to the surface?






18. What enzyme is needed to activate the following reactions? - Chymotrypsinogen to chymotrypsin






19. What vein is formed by the union of the right and left brachiocephalic veins?






20. What is the respiratory compensation mechanism for metabolic alkalosis?






21. By What age should children be able to draw the following figures? - Rectangle






22. What axis I disorder is characterized by pronoun reversal - preference for inanimate objects - obliviousness to the external environment - lack of separation anxiety - and abnormalities in language development?






23. What is the only Ig that crosses the placenta?






24. What type of correlation is defined as x Two variables that go together in the same direction?






25. What is the term for the ability of a test to measure something consistently?

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26. What is the term for normal cellular genes associated with growth and differentiation?






27. Name the type of regeneration (i.e. - labile - stable - or permanent) based on the following examples - Hematopoietic cells






28. Results in vitamin B12 malabsorption.






29. What area of the limbic system is responsible for attaching emotional significance to a stimulus?






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






31. What form of bilirubin can cross the blood - brain barrier?






32. What nucleus - found in the intermediate zone of the spinal cord - sends unconscious proprioception to the cerebellum?

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33. What CN nucleus receives auditory information from both ears via the cochlear nuclei?






34. What immunologic syndrome is due to a pharyngeal pouch 3 and 4 failure?

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35. Name the hepatitis virus based on the following information - Enveloped DNA hepadnavirus






36. What leukemia is characterized by Philadelphia chromosomal translocation (9;22); massive splenomegaly; peripheral leukocytosis (commonly > 100 - 00); decreased LAP levels; and nonspecific symptoms of fatigue - malaise - weight loss - and anorexia?






37. What is the most common one? - Skin tumor in the United States






38. Which hepatitis B Ab indicates low transmissibility?






39. Pseudorosettes






40. Name the structure that enters or exits the following foramina: x Optic canal






41. What adrenal enzyme deficiency can be summed up as a mineralocorticoid deficiency - glucocorticoid deficiency - and an excess of adrenal androgens?






42. What is the term to describe the 5'-3' sequence of one strand being the same as the opposite 5'-3' strand?






43. What is the volume of distribution (increased or decreased) of a drug when a large percentage is protein bound?






44. What is the name for failure of the allantois to close - resulting in a urachal fistula or sinus?






45. What reflex increases TPR in an attempt to maintain BP during a hemorrhage?






46. What disease that involves mental retardation - flat face - muscle hypotonia - and a double - bubble sign on radiograph poses an increased risk of Alzheimer's disease and All?






47. Which muscles of the eye are under parasympathetic control?






48. What is the term for a direct connection between the intestine and the external environment through the umbilicus because the vitelline duct persists?






49. Males are more likely to develop _______ than females.






50. What is the name of the major chemotactic agent released from x Bacteria?