Microbiology MCQs (Quiz 3) Posted on June 7, 2026June 10, 2026Author agropublishers 0 1. The standard sterilization cycle in an autoclave is generally ______°C, for _______minutes and at________ pounds per square inch (psi). 121°C for 15–20 minutes at 15 psi 100°C for 5-10 minutes at 5 psi 60°C for 20-30 minutes at 15 psi 80°C for 5-10 minutes at 10 psi 2. Which of the following is NOT a branch associated with microbiology? Virology Bacteriology Mycology Geology 3. Which instrument is used to sterilize culture media and laboratory equipment using high-pressure steam? Autoclave pH meter Microscope Incubator 4. The structure observed by Robert Hooke in cork was actually _____________ Living plant cells Dead cell walls Animal cells Bacterial colonies 5. Which of the following correctly pairs a microorganism with the branch of microbiology that studies it? Escherichia coli — Virology Plasmodium falciparum — Phycology Saccharomyces cerevisiae — Mycology Influenza virus — Bacteriology 6. The most commonly used microscope in microbiology laboratories is _______________ Electron microscope Fluorescence microscope Dark-field microscope Bright-field microscope 7. ______________ is the instrument used to magnify small objects Centrifuge Microscope Spectrophotometer Autoclave 8. Which bacterial structure is selectively permeable? Cell wall Flagellum Plasma membrane Capsule 9. Magnification refers to ___________________ Size of specimen Degree to which an image is enlarged Brightness of image Ability to distinguish two points 10. The major component of bacterial cell walls is _______________ Lignin Cellulose Peptidoglycan Chitin Loading … Question 1 of 10 Microbiology MCQs (Quiz 3)
