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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. Do high levels of estrogen and progesterone block milk synthesis?






2. In men - At What embryonic week do the primordial germ cells migrate to the indifferent gonad?






3. At what stage of cognitive development (according to Piaget) do children x Lack law of conservation and be egocentric?






4. From What aortic arch are the following structures derived?






5. What are the longest - acting and shortest - acting benzodiazepines?






6. What is the most common sexual assault?






7. Which muscarinic receptor uses a decrease in adenyl cyclase as its second messenger?






8. Where is the most frequent site of ectopic pregnancy?






9. What endocrine abnormality is characterized by the following changes in PTH - Ca2+ - and inorganic phosphate (Pi)? - PTH decreased - Ca2+ decreased - Pi increased






10. What enzyme of pyrimidine synthesis is inhibited by the following? - Methotrexate






11. What do the following values indicate? - TD50






12. What antifungal agent is activated by fungal cytosine deaminase to form 5- FU?






13. Circulating levels of what hormone cause the cervical mucus to be thin and watery - allowing sperm an easier entry into the uterus?






14. Which two negative sense RNA viruses have neuraminidase enzymes?






15. Are reabsorbed in the gallbladder.






16. What cell in the heart has the highest rate of automaticity?






17. Per Freud - with What part of the unconscious are sex and aggression (instincts) associated?






18. What syndrome is associated with the following brainstem lesions? - Vertebral artery or anterior spinal artery occlusion - resulting in contralateral corticospinal tract and medial lemniscus tract deficits and an ipsilateral CN XII lesion






19. Which kidney is lower? Why?






20. Name the most common type or cause - Meningitis in renal transplantation patients






21. What is the only 17- hydroxysteroid with hormonal activity?






22. What enzyme is deficient in alkaptonuria?






23. What is the most common one? - Malignant carcinoma of the ovaries






24. Where is the lesion that produces these symptoms when a patient is asked to look to the left? Neither eye can look left with a slow drift to the right






25. What are the four posttranslational modifications done by the Golgi apparatus?






26. What is the term for the summation of mechanical stimuli due to the skeletal muscle contractile unit becoming saturated with calcium?






27. What is the name of inflammation of the prepatellar bursa?

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28. What are the two most important features in the diagnosis of malaria?






29. What is the term for the difference between the highest and the lowest score in a population?






30. What nematode is known as whipworms? What is the treatment?






31. What is the most common one? - Type of hernia seen in males more than 50 years old






32. What is the term for pupils that react normally to accommodation but have bilateral loss of constriction in response to light?






33. Name the antidote - Carbon monoxide (CO)






34. What commonly encountered overdose produces headache - tinnitus - respiratory alkalosis - metabolic acidosis - confusion - vomiting - and tachypnea?






35. What two substances stimulate Sertoli cells?






36. What is the antidote for organophosphate ingestion?






37. Name the period described by the following statement: no matter how strong a stimulus is - no further action potentials can be stimulated.






38. What is the label given to an individual whose IQ is x 120 to 129






39. How many ATPs are hydrolyzed every time a skeletal muscle cross - bridge completes a single cycle?






40. What type of scheduled reinforcement states that after a desired response - the reinforcement is given x Varying in the number of responses?






41. What subset of adenocarcinoma arises from the terminal bronchioles and/or alveolar walls?






42. What components of the complement cascade form the MAC?






43. What enzyme requires molybdenum as a cofactor?






44. What is the term for diffusion of water across a semipermeable or selectively permeable membrane?






45. What phase of the female cycle occurs during days 1 to 15?






46. What preganglionic sympathetic fibers are responsible for innervating the foregut and the midgut?






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






48. What nucleus of the hypothalamus is the satiety center - regulating food intake?






49. What transmural inflammatory bowel disease can be found from the mouth to anus - has noncaseating granulomas - is discontinuous (skip lesions) - and has a cobblestone appearance - thickening of the bowel wall - linear fissures - and aphthous ulcers w






50. Is linolenic acid an omega -3 or omega -6 fatty acid?







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