Microbiology MCQs (Quiz 5) Posted on June 8, 2026June 10, 2026Author agropublishers 0 1. Most pathogenic bacteria are _________________________ Photoautotrophs Phototrophs Chemoheterotrophs Chemoautotrophs 2. If a microorganism cannot grow without an organic carbon source, it is most likely a __________ Heterotroph Autotroph Chemoautotroph Photoautotroph 3. __________________ microorganisms can synthesize organic compounds using carbon dioxide as their only carbon source Chemoheterotrophs Photoheterotrophs Autotrophs Heterotrophs 4. Joseph Lister introduced the use of _______ to reduce infections during surgery Iodine Alcohol Carbolic acid Hydrogen peroxide 5. A microorganism moves toward oxygen-rich regions. This specialized form of taxis is called __________________ Thermotaxis Phototaxis Geotaxis Aerotaxis 6. The enlargement of an image compared with the actual size of the specimen is known as ___________________ Magnification Resolution Refraction Illumination 7. Eukaryotic cytoplasmic ribosomes are ___________ 80S 50S 70S 30S 8. The fungal cell wall is primarily composed of ____________ Peptidoglycan Chitin Cellulose Lignin 9. Which microscope provides the highest resolution among the following? Electron microscope Dark-field microscope Bright-field microscope Phase-contrast microscope 10. The primary function of an autoclave is to _______________________ Observe microorganisms Measure microbial growth Sterilize materials using steam under pressure Store culture media Loading … Question 1 of 10 Microbiology MCQs (Quiz 5)