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