Microbiology MCQs (Quiz 4) Posted on June 7, 2026June 10, 2026Author agropublishers 0 1. The outermost layer of many bacterial capsules is predominantly _________________ Phospholipid Peptidoglycan Protein Polysaccharide 2. A Gram-positive bacterium is generally more susceptible to lysozyme because it possesses a ____________ Thin peptidoglycan layer Thick exposed peptidoglycan layer Thick outer membrane Protein capsule 3. In microbiology, chemotaxis refers to __________ Capsule formation Cell division Movement in response to chemical stimuli Protein synthesis 4. The genetic material in bacterial plasmids consists of ___________________ Polysaccharide RNA Circular DNA Protein 5. An antibiotic targets peptidoglycan synthesis. Which microbial structure will be most affected? Ribosome Capsule Cell wall Plasma membrane 6. Which statement best explains why Robert Hooke’s observations were important to biology? He discovered DNA within cells He provided the first recorded description of cells, laying the foundation for cell theory He identified the process of cell division He proved that all cells contain nuclei 7. Which of the following discoveries occurred during the golden age of microbiology (1857–1914)? Discovery of penicillin Development of the germ theory of disease Discovery of DNA structure First observation of bacteria by Leeuwenhoek 8. The scientist associated with antiseptic surgery is _________________ Robert Brown Joseph Lister Edward Jenner Alexander Fleming 9. A laboratory technician sets the autoclave to 121°C for 15 minutes but forgets to close the exhaust valve. The most likely outcome is _____________________________________ Sterilization occurs faster because air helps heat transfer Air is not completely removed, preventing steam from reaching 121°C, leading to failed sterilization Effective sterilization, but a longer time is needed The autoclave explodes immediately 10. The plasma membrane mainly consists of _________________ Cellulose Chitin Peptidoglycan Phospholipids and proteins Loading … Question 1 of 10 Microbiology MCQs (Quiz 4)
