Free Questions and Answers for All Medical Students all over the World
Q- A patient with chronic kidney disease develops secondary hyperparathyroidism. Which of the following biochemical changes directly stimulates parathyroid hormone (PTH) secretion in this condition? A- Decreased 1,25-dihydroxyvitamin D levels B- Decreased serum phosphate C- Increased calcium-sensing receptor activation D- Increased intestinal calcium absorption Q- A mutation prevents phosphorylation of the regulatory light chain … Read more
Q- A 59-year-old man presents with progressive exertional dyspnea and fatigue. Cardiac exam reveals a harsh systolic murmur best heard at the right upper sternal border that radiates to the carotids. What is the most likely diagnosis? A- Aortic regurgitation B- Aortic stenosis C- Mitral regurgitation D- Mitral stenosis Q- A 26-year-old woman presents … Read more
Q- A 59-year-old man presents with progressive dysphagia. Endoscopy reveals an ulcerated mass in the distal esophagus. Biopsy shows malignant gland-forming cells. Which risk factor is most strongly associated with this condition? A- Alcohol consumption B- Chronic gastroesophageal reflux disease C- Human papillomavirus infection D- Iron deficiency anemia Q- A 66-year-old woman presents with … Read more
Q- A 67-year-old man presents with sudden onset left arm weakness and facial droop that resolved completely within 30 minutes. CT scan of the head is normal. What is the most likely diagnosis? A- Intracerebral hemorrhage B- Ischemic stroke C- Subarachnoid hemorrhage D- Transient ischemic attack Q- A 34-year-old woman presents with heat intolerance, … Read more
Q- A patient treated with cisplatin develops hearing loss. What is the mechanism of this adverse effect? A- Accumulation in cochlear hair cells B- Autoimmune inner ear inflammation C- Decreased cerebral perfusion D- Inhibition of prostaglandin synthesis Q- A patient taking phenelzine develops severe hypertension after eating aged cheese. What is the underlying cause … Read more
Q- A 6-month-old infant presents with recurrent bacterial and fungal infections. Laboratory testing shows markedly decreased CD18 expression on neutrophils. Which of the following mechanisms is primarily impaired? A- Chemotaxis toward IL-8 B- Diapedesis through endothelium C- Phagolysosome fusion D- Reactive oxygen species formation Q- A patient with chronic alcoholism develops confusion, ophthalmoplegia, and … Read more