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