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