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Which of the following is NOT a physical method of microbial control?
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- Besides dehydrated foods, how might the amount of water available to microbes be decreased? Group of answer choices Treatment by non-ionizing radiation. Treatment at high pressures for extended periods of time. Storage at temperatures between -2 and 4 °C. Pasteurization Addition of solutes such as salt or sugar.What statement correctly explains why moist-heat is more effective than dry-heat for sterilization purposes? The microbe's molecules are resistant to alteration in the absence of water. Dry heat will always be a lower temperature than moist heat. Dry heat dehydrates the microbes, and dehydration is a method of preserving microbes. Water is a good conductor of heat.Which of the following factors is NOT significant in determining the effectiveness of a microbial treatment? Group of answer choices The toxins secreted by the microbe being treated. The susceptibility of the microbe to the treatment. The concentration of the treatment. The length of exposure to the treatment
- In the laboratory, autoclaving is required to prepare media for the growth of microorganism. What type of method of control does this involve? Dry Heat Moist Heat Chemical Radiation All of the optionsWhich of the following treatments would be most useful to remove microbes from air pumped into a surgical environment? Giant magnets Filtration Gaseous glutaraldehyde Gaseous alcoholWhich of the following statements regarding microbial control agents is FALSE? Question options: strongly acidic or alkaline disinfectants are typically more effective than neutral pH agents the presence of extracellular fats typically decreases the effectiveness of control agents a warmed disinfectant is typically more effective than the same disinfectant at room temperature substances secreted by members of biofilms increase protection against microbial control agents all of these statements are TRUE bacterial endospores are more resistant to antimicrobial treatment than vegetative bacterial cells
- Which of the following is an example of pasteurization? A surgeon washes her hands before surgery. A public toilet is treated with disinfectants. A nurse prepares an injection site with an alcohol swab. An autoclave is used to prepare nutrient agar. Heat is used to kill potential pathogens in apple juice.If lysozyme is added to a microbial culture. Predict what will be observed if the culture is affected by the action of lysozyme. A change in color will be visible in the tube. An increase in absorbance will be observed over time. A decrease in absorbance will be observed over time. An increase in turbidity will be observed over time.Use of chemical agents to destroy microbes on skin or tissues Reinoval of microbes from surfaces by scrubbing Removal or destruction of all microbes Use of chemical agents to destroy microbes on surfaces used by the public Use of physical/chemical agents to destroy microbes on non-living objects Free of contamination by pathogens Antisepsis (antiseptic) Aseptic Degerming Sanitization Sterilization Disinfection
- Which process gets rid of the most germs on a surface? decontamination disinfection sterilizationWhich of the following are true regarding UV disinfection? Mark all that apply. Water must be clear, so light can kill pathogens It is the cheapest method of disinfection The water has to flow at a specific speed past the UV light Only about 85% of pathogens are killed by UV It is very rarely used in water disinfection due to high costsWhich of the following statements regarding microbial death is FALSE? Question options: cell walls are targeted by all microbial control agents all of these statements are TRUE many antimicrobial agents function through the disruption of protein structure under a given set of conditions, the fraction of a microbial population tht dies per minute is typically constant over time the effectiveness of an antibacterial agent is a function of its microbial death rate the rate at which microbes are killed is termed the microbial death rate