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