Gluconeogenesis is a metabolic process in which glucose is generated from non-carbohydrate carbon substrates. Which one of the following substrates does NOT share its carbon in glucose skeleton but rather contributes as an energy source for gluconeogenesis? A- Acetyl CoA B- Alpha-ketoglutarate C- Fumarate D- Oxaloacetate E- Succinyl CoA Answer Acetyl CoA is an energy […]
repeated usmle questions
Repeated USMLE Questions Step 1- 172
A 22-year-old woman presents to the clinic for a recurrent urinary tract infection. She is prescribed trimethoprim/sulfamethoxazole. What is the mechanism of action of this antimicrobial drug? A- Inhibition of bacterial wall synthesis B- Inhibition of folic acid synthesis C- Inhibition of bacterial protein synthesis D- Inhibition of mycolic acid synthesis E- Inactivation of bacterial […]
Repeated USMLE Questions Step 1- 171
A 5-year-old boy is brought to the ER by his mother. He has fever, cough, lethargy, headache and neck pain. On examination, his temperature is 103.2 F, his neck is rigid and tender and Kernig sign is positive. CSF is clear and significant for glucose 60 mg/dL, protein 80 mg/dL, no bacteria or pus cells […]
Repeated USMLE Questions Step 2 CK- 411
A 25-year-old woman presents to the clinic complaining of general aches for two years. Pain is getting worse over the past 3 months. Every morning, she has stiffness all over her body, which is usually relieved in about 5-10 min. She has no history of trauma or any medical condition. Her BMI is 21 and […]
Repeated USMLE Questions Step 1- 170
A 37-year-old man visits his physician with complaints of sore throat, fever and muscle aches for 4 days. Throat swab is negative. His physician discussed with him the use of antibiotics in his case. The patient had read in an old magazine that one of the antibiotics is effective but the his physician explains that […]
Repeated USMLE Questions Step 1- 169
A 3-year- old boy is brought to the emergency room by his mother for vomiting and bloody diarrhea for 4 days. She also noticed low urinary output in the past 2 days. He had no similar attacks in the past and his medical and family histories are unremarkable. On examination, his vital signs are within […]
Repeated USMLE Questions Step 2 CK- 410
A 46 year old woman with systemic lupus erythematosus presents to the clinic for follow up. She takes prednisone daily for 3 months. Her condition is stable and she has no complaints since her last visit 3 months ago. She smokes a pack of cigarette daily for 15 years. She said that she is not […]
Repeated USMLE Questions Step 1- 168
A 20-year old female student represents with a 1-week history of nausea, vomiting and anorexia. She returned 2-weeks ago from a trip to Guatemala. On physical examination, her temperature was 100.3 F, clear chest and she has mild jaundice and a palpable tender liver. Her CBC was normal and her liver function tests are as […]
Repeated USMLE Questions Step 1- 167
A 24-year old woman is diagnosed with vaginal trichomoniasis. She is prescribed metronidazole. She is breastfeeding her 3 month old boy. What is the appropriate advice for this patient concerning the use of metronidazole during breastfeeding? A-Stop breast feeding and replace it with formula for 3 months B-Stop metronidazole and choose another less effective drug […]
Medical Question of the Day- 23
A 55 year-old man presents to the clinic because today he noticed that his left scrotum has suddenly gotten larger. He has no fever or pain. Examination reveals enlarged left scrotum with no tenderness or any signs of inflammation. There is a worm-like mass posterior to the left testicle. The mass illuminates and is not […]