MCQs Week 15 Loading... 1. Which of the following antibiotics is bacteriostatic? CiprofloxacinGentamicinTrimethoprimPenicillin Loading... 2. The orbit contains all of the following EXCEPT Branches of the facial nerveOptic nerveOculomotor nerveTrochlear nerve Loading... 3. A 10yr old male presented with a two day history of fever, pharyngitis and a generalised punctate erythematous rash with circumoral pallor. What is the most likely causative organism? Streptococcus pyogenesStreptococcus pneumoniaeStaphylococcus aureusStaphylococcus epidermidis Loading... 4. Regarding calcium Ionised calcium level is unrelated to pHThe bound form is essential to blood coagulationAn increase in the diffusible form causes an excitatory effect in nerve and muscle cellsPlasma calcium is partly bound to proteins and partly in diffusible form Loading... 5. Which of the following organisms is the most common cause of gram-negative bacterial pneumonia? Escherichia coliKlebsiella pneumoniaeSerratia marcescensEnterobacter aerogenes Loading... 6. Sulphonamides are structural analogues of Para amino benzoic acidDihydrofolic acidFolic acidTetrahydrofolic acid Loading... 7. Which of the following antibiotics is beta-lactamase resistant? AmpicillinDicloxacillinBenzathine penicillinPiperacillin Loading... 8. Which of the statements regarding penicillins are FALSE? Oral penicillins should be given with food10% of excretion of ampicillin is by glomerular filtrationThere is a risk of seizures in patients with renal failureAmpicillin and Amoxicillin can cause non-allergenic skin rashes Loading... 9. The base of skull Provides passage for the maxillary nerve via the foramen ovaleProvides passage for the vertebral arteries via the condylar canals Accommodates the pituitary gland in the anterior cranial fossaAccommodates the sigmoid sinuses in the posterior fossa Loading... 10. Regarding the facial vein, all of the following are true EXCEPT It drains into the internal jugular veinIt has no valvesIt communicates with the cavernous sinus via the ophthalmic veinsIt begins as a continuation of a plexus of scalp veins in the region of the pterion Loading... 11. What is the mechanism of action of botulism toxin secreted by Clostridium Botulinum? Blocks the release the of the neurotransmitter gamma-aminobutyric acid from neuronsDisrupts tight junctions between epithelial cellsInhibits the release of acetylcholine at the neuromuscular junctionDegrades cell membrane and extracellular matrix proteins Loading... 12. In calcium metabolism PTH increases phosphate excretion in the urineHuman calcitonin has a half-life of 30 minutesCalcitonin increases bone resorptionGastrin, glucagon and secretin inhibit calcitonin secretion Loading... 13. In the skull The anterior fontanelle usually closes by two monthsThe pterion overlies the middle meningeal arteryThe round foramen transmits the mandibular branch of the fifth cranial nerveThe cribiform plate is part of the sphenoid bone Loading... 14. Which of the following is INCORRECT regarding the trigeminal nerve? It has no motor fibresThe ophthalmic division supplies the tip of the noseThe maxillary division traverses the foramen rotundumIt gives rise to the infraorbital nerve Loading... 15. Which cephalosporin has activity against pseudomonas? CeftriaxoneCefepimeCefuroximeCephazolin Loading...
