Free Questions and Answers for All Medical Students all over the World
A 5-year-old girl with a mass in her neck is brought to the clinic for an evaluation. Her mother says that this mass appeared 6 months ago and is increasing in size. There is no pain or discomfort. On examination, the mass is in the midline, inferior to the hyoid bone. Laboratory tests reveal normal … Read more
Workers in the aniline dye industry are more susceptible to bladder cancer than general population. Meanwhile, studies show that animals, when exposed to beta-naphthylamine develop liver cancer but not bladder cancer. What is the most likely explanation of this finding? A-Metabolism of beta-naphthylamine by human cytochrome 450 system in the liver B-Detoxification of beta-naphthylamine by … Read more
A 12-year-old girl visits her physician for follow up after treatment with methotrexate for acute lymphoblastic leukemia. Stool analysis reveals blood in stool. Her platelet count is very low. Which of these substances should be administered immediately? A-Vitamin K B-Leucovorin C-Deferoxamine D-Amitriptyline E-Penicillamine Answer This is a case of methotrexate toxicity. Leucovorin is the active … Read more
A 48-year-old man with a long history of type 1 diabetes and hypertension develops sudden chest pain and dizziness. On examination, pulse is 110, blood pressure is 80/50, no pulsus paradoxus, lungs are clear and jugular veins are dilated. ECG shows sinus tachycardia with ST elevation in leads II, III and AVF. What is the … Read more
As physicians, we need to know some definitions in Genetics, which are related directly to our practice and guide us to diagnose and treat many genetic disorders. These items include genome, genotype, phenotype, genetic code, gene expression, etc. Which one of the following choices describes the definition of a phenotype? A- Genetic constitution of an … Read more
A 74-year-old woman visits her physician complaining of a new onset of fatigue and temporal headache. She lost about 5-7 pounds over the last year. She also has morning stiffness for one hour accompanied by aching in the shoulders and hips. She noticed that her vision was deteriorating during the last year. Physical examination is … Read more