MCQs Week 16 Loading... 1. Regarding lymphocytes in humans Activated T lymphocytes form plasma cellsB lymphocytes do not present antigens to T lymphocytesB lymphocytes require T lymphocyte contact to produce antibodies fullySomatic mutations account for the huge diversity in immunoglobulins Loading... 2. Which of the following statements is correct with regard to the nasal blood supply? Kiesselbach's plexus is a plexus of blood vessels on the lateral wall that is prone to epistaxisThe major contributor to nasal blood supply is the sphenopalatine arteryThe nasal blood supply is solely by branches of the internal carotid arteriesThe blood supply enters principally through the cribiform plate Loading... 3. In the circle of Willis The basilar artery divides into right and left posterior cerebellar arteriesThe middle cerebral arteries branch off and supply the motor but not sensory cortexThe anterior communicating artery units the middle cerebral artery with the anterior cerebral arteryThe internal carotid artery give off the ophthalmic artery before dividing into anterior and middle cerebral arteries Loading... 4. All of the following are true regarding metronidazole EXCEPT It is used to treat GiardiaIt causes a metallic tasteIt inhibits MEOS creating a disulfiram-like effectIt is used to treat Gardnerella Loading... 5. The R wave of the ECG is due to Calcium influxChloride influxSodium influxPotassium influx Loading... 6. Which of the following viruses is NOT commonly associated with an immunodeficient state? Epstein-BarrCytomegalovirusVaricellaPicornavirus Loading... 7. Cerebrospinal fluid produced by the choroid plexus reaches the subarachnoid space directly by openings in the Lateral ventricleFourth ventricleThird ventricleDural sinuses Loading... 8. Which of the following is true regarding the pharmacokinetics of doxycycline? Fully bound by serum proteins60% bioavailability by the oral routeAbsorption is not impaired by foodWidely distributed and readily crosses the blood brain barrier Loading... 9. All of the following are contraindicated in renal failure EXCEPT NitrofurantoinTetracyclineDoxycyclineNaladixic acid Loading... 10. The incidence of aplastic anaemia following the use of chloramphenicol is approximately 1 in 101 in 3001 in 10001 in 30 000 Loading...
