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