Medical Microbiology Q&A Guide — MCQ Bank OmpathStudy

Question 1 What kinds of roaches might you expect to encounter in Athens? A. American roaches B. Smokey brown roaches C. All of the above D. None of the above E. Primarily an incidental laboratory finding Answer: A. American roaches Explanation: Athens, with its Mediterranean climate and urban environment, supports multiple cockroach species including German roaches (most common indoor species), American roaches (prefer warm, moist areas), and Smokey brown roaches (outdoor species that enter buildings). --- Question 2 What is the main advantage of using larval control against mosquitoes? A. Larval control B. Larval habitats do not support sensitive other organisms C. All of the above D. None of the above E. Usually mediated by non-specific mechanisms Answer: A. Larval control Explanation: Larval control is advantageous because mosquito larvae are confined to specific aquatic breeding sites (pools, containers, marshes) making them easier to target with larvicides or environmental management compared to flying adult mosquitoes that are widely dispersed. --- Question 3 If you found lice eggs (nits) in someone's clothing, what species would they most likely be from? A. Head lice (Pediculus capitis) B. Body lice (Pediculus humanus) C. Hog lice D. All of the above E. Mostly unchanged in early disease Answer: A. Head lice (Pediculus capitis) Explanation: Body lice (Pediculus humanus corporis) are the only lice species that lay their eggs (nits) on clothing fibers, particularly along seams of garments. Head lice attach nits to hair shafts, while crab lice attach to coarse body hair. --- Question 4 What are effective non-pesticide ways to control problems from cockroaches? A. Clean your kitchen counter tops nightly B. Seal up cracks and seams around pipes and cabinets C. All of the above D. A and C E. Reduced by routine feedback control Answer: A. Clean your kitchen counter tops nightly Explanation: Integrated pest management for cockroaches includes removing food sources (sealed containers), eliminating food residues (cleaning), and blocking entry points (sealing cracks). All these methods work together to make environments less suitable for cockroach survival and reproduction. --- Question 5 The pupal stage is found in A. Complete metamorphosis B. Both incomplete and complete metamorphosis C. Neither incomplete nor complete metamorphosis D. None of the above E. Occurs only after chronic exposure Answer: A. Complete metamorphosis Explanation: The pupal stage only occurs in complete metamorphosis (holometabolism) where insects go through egg → larva → pupa → adult stages. Incomplete metamorphosis (hemimetabolism) has only egg → nymph → adult stages with no pupal stage. --- Question 6 How does insecticide resistance develop? A. By using low doses of insecticides B. By using high or prolonged doses of insecticide C. B and C D. None of the above E. Limited to a single tissue compartment Answer: A. By using low doses of insecticides Explanation: Insecticide resistance develops through both low doses (sub-lethal doses allow resistant individuals to survive and reproduce) and high/prolonged doses (intense selection pressure favors resistant genotypes). IPM actually helps prevent resistance by reducing selection pressure. --- Question 7 Ceratopogonidae larvae are found in A. Salt marshes B. Wet muddy areas around cattle watering tanks C. All of the above D. A and B E. Primarily an incidental laboratory finding Answer: A. Salt marshes Explanation: Ceratopogonidae (biting midges/no-see-ums) larvae are semi-aquatic and found in various moist environments including freshwater marshes, salt marshes, and muddy areas around water sources. Different species adapt to different salinity and moisture conditions. --- Question 8 Integrated Pest Management A. Relies solely on biological and natural control B. Considers the biology of the target pest C. A and B D. All of the above E. Usually mediated by non-specific mechanisms Answer: A. Relies solely on biological and natural control Explanation: IPM is a comprehensive approach that considers pest biology, ecology, and behavior to develop sustainable control strategies. It integrates multiple control methods (biological, cultural, chemical, mechanical) rather than relying solely on any single approach. --- Question 9 Epidemic typhus and Chagas disease can both be vectored via A. Feces (frass) of a vector B. Mosquitoes C. Cockroaches D. A and B E. Mostly unchanged in early disease Answer: A. Feces (frass) of a vector Explanation: Both epidemic typhus (Rickettsia prowazekii via body lice) and Chagas disease (Trypanosoma cruzi via triatomine bugs) are transmitted through contaminated vector feces rubbed into bite wounds or mucous membranes, not through vector saliva. --- Question 10 Which of the following groups of Glossina species is insignificant in the transmission of Trypanosoma brucei rhodesiense? A. Morsitans group B. Fusca group C. None of the above D. All of the above E. Reduced by