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