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