Microbiology MCQs (Quiz 4) Posted on June 7, 2026June 10, 2026Author agropublishers 0 1. An antibiotic targets peptidoglycan synthesis. Which microbial structure will be most affected? Plasma membrane Capsule Ribosome Cell wall 2. The genetic material in bacterial plasmids consists of ___________________ Polysaccharide RNA Protein Circular DNA 3. A Gram-positive bacterium is generally more susceptible to lysozyme because it possesses a ____________ Thick outer membrane Thick exposed peptidoglycan layer Protein capsule Thin peptidoglycan layer 4. The outermost layer of many bacterial capsules is predominantly _________________ Polysaccharide Peptidoglycan Phospholipid Protein 5. The scientist associated with antiseptic surgery is _________________ Alexander Fleming Robert Brown Joseph Lister Edward Jenner 6. Which statement best explains why Robert Hooke’s observations were important to biology? He discovered DNA within cells He identified the process of cell division He provided the first recorded description of cells, laying the foundation for cell theory He proved that all cells contain nuclei 7. In microbiology, chemotaxis refers to __________ Protein synthesis Cell division Movement in response to chemical stimuli Capsule formation 8. A laboratory technician sets the autoclave to 121°C for 15 minutes but forgets to close the exhaust valve. The most likely outcome is _____________________________________ 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 Sterilization occurs faster because air helps heat transfer 9. The plasma membrane mainly consists of _________________ Cellulose Chitin Phospholipids and proteins Peptidoglycan 10. Which of the following discoveries occurred during the golden age of microbiology (1857–1914)? Discovery of DNA structure Discovery of penicillin Development of the germ theory of disease First observation of bacteria by Leeuwenhoek Loading … Question 1 of 10 Microbiology MCQs (Quiz 4)
