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