This is the answer and explanation for USMLE Question #19 from the Dr. Ray Makar Facebook page. Try it first, then check your answer below. The Question A biopsy of an irregular, multicolored pigmented lesion on the back confirms malignant melanoma. Which factor is most important for prognosis? A. Breslow thickness (depth of invasion)B. Diameter … Read more
This is the answer and explanation for USMLE Question #18 from the Dr. Ray Makar Facebook page. Try it first, then check your answer below. The Question A healthy man flies from sea level to a city at 4,000 meters. Which acid–base change develops first? A. Metabolic acidosisB. Metabolic alkalosisC. Respiratory acidosisD. Respiratory alkalosis Correct … Read more
Five USMLE Step 1 immunology questions with answers and explanations: type I hypersensitivity, DiGeorge syndrome, chronic granulomatous disease, MHC, and transplant rejection.
This is the answer and explanation for USMLE Question #16 from the Dr. Ray Makar Facebook page. Try it first, then check your answer below. The Question A 19-year-old college student has fever, sore throat, posterior cervical lymphadenopathy and splenomegaly. He develops a diffuse rash after taking amoxicillin. What is the most likely cause? A. … Read more
This is the answer and explanation for USMLE Question #15 from the Dr. Ray Makar Facebook page. Try it first, then check your answer below. The Question A 34-year-old woman with bipolar disorder has been taking lithium for 5 years. She now has polyuria and polydipsia. Urine osmolality stays low after water deprivation and after … Read more
These 10 board-style microbiology questions cover the high-yield facts that USMLE Step 1 and medical school exams test again and again: toxins, culture media, classic infections and first-line treatments. Pick an answer, then open Answer and Explanation to check yourself. Questions written by Dr. Ray Makar, retired dermatologist and USMLE teacher. Bacteria and Their Toxins … Read more