Microbiology MCQs (Quiz 4) Posted on June 7, 2026June 10, 2026Author agropublishers 0 1. The plasma membrane mainly consists of _________________ Peptidoglycan Chitin Cellulose Phospholipids and proteins 2. The scientist associated with antiseptic surgery is _________________ Edward Jenner Alexander Fleming Joseph Lister Robert Brown 3. The outermost layer of many bacterial capsules is predominantly _________________ Peptidoglycan Phospholipid Protein Polysaccharide 4. 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 5. In microbiology, chemotaxis refers to __________ Capsule formation Movement in response to chemical stimuli Cell division Protein synthesis 6. An antibiotic targets peptidoglycan synthesis. Which microbial structure will be most affected? Ribosome Plasma membrane Cell wall Capsule 7. 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 8. Which statement best explains why Robert Hooke’s observations were important to biology? He proved that all cells contain nuclei He identified the process of cell division He provided the first recorded description of cells, laying the foundation for cell theory He discovered DNA within cells 9. Which of the following discoveries occurred during the golden age of microbiology (1857–1914)? Development of the germ theory of disease Discovery of penicillin First observation of bacteria by Leeuwenhoek Discovery of DNA structure 10. The genetic material in bacterial plasmids consists of ___________________ Polysaccharide RNA Circular DNA Protein Loading … Question 1 of 10 Microbiology MCQs (Quiz 4)
