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