Home » Quizzes & Surveys » LectusLectusby Avi June 30, 2026 Instructions Marks 4. Penalty -1. Deselect to leave blank. ⏰️ starts when Start clicked. 1. 82 A 2-year-old boy presents with what the mother describes as “a sore on the back of his throat.” She states that her son had a fever and complained of throat pain two days ago. In addition, she states that he has been fussy and eating poorly. On examination, it appears that the child has met all appropriate developmental milestones and is well nourished. He has submandibular and anterior cervical lymphadenopathy. On oral examination, fewer than 10 lesions are visible on bilateral tonsillar pillars and soft palate. These are accompanied by surrounding erythema. After four days, the lesions disappear without treatment. Which of the following is the most likely causative agent?Deselect Answer Herpes simplex virus type 1 Varicella-zoster virus Coxsackievirus A Staphylococcus aureus Type 2 hypersensitivity reaction None Show Hint This virus is a member of the picornavirus family and commonly causes hand, foot, and mouth disease in children. 2. L43 A 45-year-old man presents to an urgent care clinic because he coughed up blood this morning. Although he has had a persistent cough for 3 weeks, he had never coughed up blood until now. His voice is hoarse, and he admits that it has been like that for the past few months. Both his past medical history and family history are non-significant. He has smoked a pack of cigarettes a day since the age of 20 and drinks a glass of wine every evening. His vital signs include pulse rate 78/min, respiratory rate 14/min, temperature 36.5°C (97.8°F), and blood pressure 140/88 mm Hg. An indirect laryngoscopy reveals a rough vegetating lesion on the free border of the right vocal cord. Which of the following is the most likely diagnosis?Deselect Answer Acute laryngitis Leukoplakia Vocal cord nodule Polypoid corditis Laryngeal carcinoma None Show Hint This condition is associated with risk factors such as smoking and alcohol consumption. Patients typically present with hoarseness, chronic cough, and sometimes hemoptysis. 1 out of 2 3. L100 A scientist is studying the development of CD8+ T cells. In his experiments, he uses a radioactive isotope to mark a population of T cells. Once injected into the thymus, these cells bind tightly to MHC I self-antigen complexes. Later in the experiment, the scientist cannot find any marked cells in the peripheral blood. Which of the following processes is responsible for the loss of these marked CD8+ cells?Deselect Answer APC antigen presentation Activation IL-2 stimulation Positive selection Negative selection None Show Hint The core concept here is T cell development in the thymus, specifically how immature T cells interact with self-antigens presented by MHC molecules. What happens to T cells that bind too tightly to self-antigen during this process? 4. L54 An 8-year-old boy is brought to the pediatrician by his parents due to continued soiling accidents. The parents report that the child has been having episodes of fecal incontinence for the past year, with soiled underwear occurring almost daily. The soiling usually happens in the afternoon after school. The child denies any pain with defecation but admits to avoiding the school bathrooms. Physical examination reveals no abnormalities, and the rectal examination shows a large amount of stool in the rectum. Laboratory studies including thyroid function tests and celiac panel are normal. Which of the following is the most appropriate initial intervention for this child?Deselect Answer Dietary restriction of dairy products Anticholinergic medication Immediate referral for psychotherapy Daily enemas for one month Bowel cleanout followed by scheduled toilet sitting times None 2 out of 2 Previous Start Quiz Next Time's upTime is Up!
