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