Microbiology MCQs (Quiz 12) Posted on June 9, 2026June 10, 2026Author agropublishers 0 1. Bleach is effective against many microorganisms because it acts as a strong ______________ Oxidizing agent Nutrient source Reducing agent Buffering agent 2. Primary function of the immune system includes ______________ Digesting food Transporting oxygen Distinguishing self from non-self and defending against pathogens Regulating body temperature 3. Viruses are considered acellular because they ____________ Lack genetic material Lack a plasma membrane Lack proteins Are not composed of cells 4. A microbiologist needs to sterilize the nutrient agar before pouring plates. Which method should be used? Alcohol swabbing Autoclaving Boiling for 10 minutes Pasteurization 5. Chlorination is primarily intended to _______________ Sterilize surgical instruments Prepare culture media Reduce waterborne pathogens Promote microbial growth 6. ___________________________ is the substance that triggers an immune response Antigen Hormone Enzyme Antibody 7. Iodine is most commonly used as a ___________________ Skin antiseptic Surface sterilant Water disinfectant Media sterilant 8. Why is agar suitable for creating concentration gradients in microbiological media? It rapidly circulates dissolved substances Its gel matrix allows slow and controlled diffusion of molecules It prevents diffusion completely It destroys dissolved chemicals 9. Why is the transparency of agar important in microbiological studies? It prevents contamination It increases bacterial growth rates It sterilizes the culture medium It allows clear observation of colony characteristics and reactions 10. _____________________ is a fungal structure specialized for nutrient absorption and anchorage Conidium Basidium Ascus Rhizoid Loading … Question 1 of 10 Microbiology MCQs (Quiz 12)
