NBME CBSE ACTUAL TEST QUESTIONS AND ANSWERS (Quiz bank with all the correct answers) (usmle step 1) Medical examination new Update 2022/2023

NBME CBSE ACTUAL TEST QUESTIONS AND ANSWERS (Quiz bank with all the correct answers) (usmle step 1) Medical examination new Update 2022/2023 62 year old woman - osteoporosis - a bisphosphonate is prescribed. The expected beneficial effect of the drug is due to which of the following? -Answer= Decreased Osteoclast Activity Cohot Study of elderly women - relative risk ratio for hip fractures among those who exercise regularly is 1.2 (95% confidence interval of 1.1 to 1.8). Which of the following is the conclusion about the effect of exercise on the risk of hip fracture? -Answer= Statistically Significant Overall Increase Risk 52 year old man goes to ER with chest pain radiating to his jaw while shoveling snow. Pulse is80/min and blood pressure is 130/70. The most immediate treatment mechanism of action? - Answer= Increased nitric oxide concentration 24 year old woman - spilled hot grease on her left leg while working at a fastfood restaurant. Exam of leg shows 7cm pink, soft, granular, edematous wound. The formation of this tissue was most likely caused by increased activity of which? -Answer= a. Vascular Endothelial Growth Factor VEGF - stimulates angiogenesiss. TYPE III Collagen = Blood Vessels - early wound repair 27 year old man- MVC - skull x-ray shows a linear, nondepressed basal skull fracture - increased serum osm and decreased urin osm. Following desmopressin urine osm increases. Desmopressin's effect is due to the activation of which of the following? -Answer= a. Adenylyl Cyclase Adenylate Cyclase - ATP - CAMP -- PROTEKINASEA -- Cav2 A 10 month old boy - 4 day history of fever and cough. He attends day care center. Chest exam shows intercostal retractions along with bilateral, diffuse wheezes and expiratory rhonchi. The infectious agent most likely has which of the following properties? -Answer= Mediation of Cell Entry via a fusion protein A 17 year old girl in ED - 15 minutes after being stung by a bee. Mild light headedness but no difficulty swallowing- Bilateral wheezing - Which is most appropriate pharmacotherapy for this patient? -Answer= B2- Agonist 14 year old boy - 2 day history of sore throat and fever that peaks in late afternoon. 1 week of fatigue. He recentaly had sex with one partner. Physical exam show cervical lymphadenopathy and pharyngeal erythema with a creamy exudate. DX? -Answer= Infectious Mononucleosis 57 year old man - radiation therapy for squamous cell carcinoma of the lung. Despite therapy, tumor increases in size and he dies 6 months later. The progressive tumor growth is due to a defectin cell cycle arrest in which of the following phases of cell cycle? -Answer= G1 28 year old - lived in sub-Saharan Africa - until he came to the US. Temp of 100.4 - imaging shows bilateral hydroureter and hydronephrosis. Biopsy shows marked fibrosis and scattered granulomas. DX? -Answer= Schistosomiasis A couple with a family history of a-thalassemia. Woman has one gene deletion and man has two gene deletion. If the two gene is trans - what percentage of offspring will have a two gene deletion? -Answer= 50% previously healthy 40 year brought to emergency department by her husband - 2 day history of fever, lethargy, confusion. PE shows scattered petechiae and ecchymoses over the lower extremities - 3+ polychromasia and 3+ schistocytes and Low platelets Dx? -Answer= ThromboticThrombocytopenia Purpura 16 year old boy - is admitted to the ER because of a knife wound to the left side of his chest. An X- ray of the chest shows an air-fluid level in the left side of the chest, partial collapse of the left lung, and the elevation of the stomach bubble. The mediastinum is midline. DX? -Answer= Hemopneumpothorax under tension 49 year old woman - coronary artery disease - BP 140/90 - High Cholesterol, High LDL (190), Hightriglycerides (350) - TX with atorvastatin and losartan. What are the effects on HDL and Triglycerides? -Answer= HDL increased Triglycerides Decreased 73 yeare old - diffuse weakness and tingling of her arms and legs. Sensation and vibration and position is decreased in all extremities. What vitamin deficiency? -Answer= Vitamin B12 - (cyanocobalamin) Tea and Toast - low B12 in diet