Microbiology MCQs (Quiz 9) Posted on June 8, 2026June 10, 2026Author agropublishers 0 1. ______________ radiation is most commonly used for sterilizing disposable syringes, catheters, and surgical gloves Ultraviolet radiation Gamma radiation Infrared radiation Microwaves 2. The germicidal effectiveness of Ultraviolet (UV) radiation is greatest at approximately __________ 500 nm 254 nm 700 nm 900 nm 3. Which microorganism contains 70S ribosomes? Escherichia coli Amoeba Paramecium Yeast 4. Agar exhibits thermal hysteresis because _______________ Bacteria degrade it It changes color during heating Its melting temperature is much higher than its solidification temperature It contains proteins 5. In microbiology, UV radiation is mainly used for ___________ Sterilizing culture media Surface disinfection Deep tissue sterilization Sterilizing surgical instruments 6. Which principle is involved in sterilization by membrane filtration? Heat destruction Chemical inactivation Physical separation Radiation damage 7. Most pathogenic microorganisms obtain both energy and carbon from ______________ Organic compounds Sunlight and CO₂ Sunlight and organic compounds Inorganic chemicals and CO₂ 8. The primary lethal effect of UV radiation on microorganisms is the formation of ________ in DNA Disulfide bonds Peptidoglycan cross-links ATP molecules Thymine dimers 9. Chlorine is most widely used in public health for the disinfection of _____________ Surgical instruments Hospital floors Water Culture media 10. Joseph Lister’s introduction of antiseptic surgery significantly reduced ____________________ Viral infections Post-operative infections and mortality Fermentation in food Tuberculosis transmission Loading … Question 1 of 10 Microbiology MCQs (Quiz 9)
