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