Microbiology MCQs (Quiz 6) Posted on June 8, 2026Author agropublishers 0 1. Which group of microorganisms contains 80S ribosomes in its cytoplasm? Cyanobacteria Actinomycetes Bacteria Fungi 2. The development of antiseptic surgery by Joseph Lister was inspired by the work of _______________ Edward Jenner Robert Koch Alexander Fleming Louis Pasteur 3. An autoclave reaches 121°C, but the pressure gauge remains below the recommended level. What is the most likely consequence? Effective sterilization Incomplete sterilization due to insufficient steam penetration Improved spore destruction Faster sterilization 4. Which pair of scientists is most associated with the beginning and the end (respectively) of the Golden Age of Microbiology? Pasteur (beginning) and Ehrlich (end) Leeuwenhoek (beginning) and Fleming (end) Jenner (beginning) and van Leeuwenhoek (end) Hooke (beginning) and Koch (end) 5. Which of the following materials cannot be sterilized in a standard autoclave and requires an alternative method? Surgical instruments Heat-sensitive antibiotics Nutrient agar Distilled water 6. ______________________ is the primary purpose of culture media in microbiology Sterilization Identification Microscopy Growth of microorganisms 7. A bacterial population accumulates near a source of amino acids. This behavior indicates ___________________ Random movement Phototaxis Positive chemotaxis Negative chemotaxis 8. Cyanobacteria are generally classified as ______________ Photoheterotrophs Chemoheterotrophs Photoautotrophs Chemoautotrophs 9. Bacterial cytoplasmic ribosomes are composed of _____________ 40S and 60S subunits 30S and 50S subunits 50S and 60S subunits 30S and 40S subunits 10. Microbial nutritional group ________________ obtains both energy and carbon from organic compounds Photoautotrophs Photoheterotrophs Chemoheterotrophs Chemoautotrophs Loading … Question 1 of 10
