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.

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.

Basic Clinical Lab Competencies for Respiratory Care: An Integrated Approach

5th Edition

ISBN:9781285244662

Author:White

Publisher:White

Chapter19: Equipment Processing And Surveillance

Section: Chapter Questions

Problem 3SEPT

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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 statements regarding microbial death is FALSE? Question options: cell walls are targeted by many microbial control agents the effectiveness of an antibacterial agent is a funciton of its microbial death rate the rate at which microbes are killed is termed the microbial death rate all of these statements are TRUE few antimicrobial agents function through the disruption of protein structure under a given set of conditions, the fraction of a microbial population that dies per minute is typically constant over time
Which 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
When food leftovers are stored in a refrigerator, how does this help prevent food borne illnesses? Group of answer choices Low temperatures deactivate any toxins that might be produced by microbes. Low temperatures inhibit the metabolism and growth of microbes. Low temperatures disrupt microbe membranes and kill any microbes that are present. Low temperatures prevent microbes from forming biofilms.
which of the following is not a chemical method of microbial control? a. soaps and detergents b. hydrogen peroxide c. filtration d. food preservations
Which 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
A broth containing 1 million bacterial cells is treated with an antimicrobial agent that kills 90% of the cells in 1 minute. What is the minimum amount of time it will take before all the cells in the broth are dead? 3 minutes 5 minutes 7 minutes 10 minutes
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
Which of the following is NOT a physical method of microbial control? Freezing. Autoclave. flaming a loop. or ethylene oxide gas
Sewage works use microbes in many ways to break down organic matter. Which of the following processes is NOT carried out? Pathogenic bacteria and viruses are added to the input sewage as a tracer and to ensure the processes have all worked well Bacteria and archaea are used in sludge digesters to breakdown organic matter anaerobically Bacterial trickle filter beds have a wide variety of microbes to break down organic matter Activated sludge selects for Gram negative bacteria that break down waste
A microbe is growing on Sabouraud dextrose agar, which has a slightly acidic pH. Which of the following is this microbe likely to be? a Gram-negative bacterium an acid-fast bacterium a fungus a Gram-positive bacterium
Which of the following prevented an aerotolerant anaerobic, mesophilic and halophilic bacterium from contaminating your home aquarium? the water was at 37ºC you placed a high amount of glucose into the aquarium you placed several pennies in the aquarium you were using a .45 um filtering unit you placed carbon dioxide instead of oxygen into the aquarium