A 7-year-old child develops hives, facial swelling, and wheezing within minutes of eating peanut butter. Which type of hypersensitivity reaction is most consistent with this clinical presentation?

Which of the following best describes the role of antigen-presenting cells (APCs) in the adaptive immune response?

A 55-year-old man presents to his primary care physician for a wellness checkup. He states that he generally feels well and has no complaints at this time. The patient consumes alcohol frequently, eats a high sodium diet, is sedentary, and meets criteria for class-I obesity. His temperature is 97.5°F (36.4°C), blood pressure is 167/108 mmHg, pulse is 90/min, respirations are 15/min, and oxygen saturation is 99% on room air. The patient’s blood pressure at his last 2 appointments were 159/100 mmHg and 162/99 mmHg, respectively. His physician wants to intervene to manage his blood pressure. Which of the following is the most effective treatment for this patient’s hypertension?

Which type of mutation is most likely to have no effect on protein function?

Which one of the following is a sign of left heart failure? 

A 58-year-old man receives a kidney transplant. Two weeks later, his creatinine levels rise and a biopsy reveals infiltration of lymphocytes and evidence of vascular injury in the transplanted kidney. Which of the following best explains the immunologic basis of this reaction?

A 25-year-old female comes to you with a 4-months history of fatigue. Her history is unremarkable; she had no major medical illness. She has noticed that during the past 12 months her menstrual periods have become heavier and longer for 7 to 9 days with very heavy flow. On examination, the patient appear pale , BP 100/70 mmHg. Blood smear is shown below. Her Hb is 9.5 g/dl. What is the most likely cause of her disease?  

Which one of the following is NOT a risk factor of mycardial infarction?

Which one of the following is NOT a sign of diabatic ketoacidosis (DKA)?

A 72-year-old man develops muscle wasting in his lower limbs after being immobilized for 4 weeks due to a pelvic fracture. Microscopic evaluation reveals reduced cell size and increased activity of the ubiquitin-proteasome system. Which of the following best characterizes this type of cellular adaptation?