Which of the following statements regarding low temperature storage is FALSE? Question options: freezing inhibits microbes through the unavailability of water freezing causes microbial death largely through DNA denaturation all of these statements are TRUE refrigeration functions largely by reducing the metabolic rate of microbes psychrophiles are generally not effectively inhibited by refrigeration many bacteria can survive freezing for years at a time

Introduction :- In households, most of the daily use products are stored in refrigerator for their…

Answered: Which of the following statements…

Biomedical Instrumentation Systems

1st Edition

ISBN:9781133478294

Author:Chatterjee

Publisher:Chatterjee

Chapter19: Biomedical Laboratory Instrumentation

Section: Chapter Questions

Problem 4Q

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Which of the following statements regarding low temperature storage is FALSE? Question options: all of these statements are TRUE refigeration inhibits microbes through the unavailability of water low temperature storage the metabolic rate of microbes many bacteria can survive freezing for years at a time psychrophiles are generally not effectively inhibited by refrigeration freezing causes microbial death through membrane destruction
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
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.
Which of the following treatments would be most useful to remove microbes from air pumped into a surgical environment? Giant magnets Filtration Gaseous glutaraldehyde Gaseous alcohol
What type of microbes can not be effectively killed by low temperature (i.e. freezing) treatment? methogens thermophiles mesophiles psychrophiles halophiles
Microbes that can survive and thrive in extreme environments are called extremophiles. In this context, what term is the most accurate to describe the microbes that can grow in salty wastewater? Acidophiles Psychrophiles Thermophiles O Halophiles
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
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
Which of the following microbes grow best below 20 degrees C? thermophiles mesophiles hyperthermophiles psychrophiles
Which of the following statements regarding boiling is FALSE? Question options: all of these statements are TRUE autoclaves routinely use temperatures notably higher than the normal boiling point of water at higher elevations, boiling times need to be increased to achieve the same degree of microbial control boiling kills cells mainly by the destruction of their DNA boiling water for ten minutes is effective in killing many microorganisms bacterial endospores are not reliably killed by boiling
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.

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	freezing inhibits microbes through the unavailability of water
	freezing causes microbial death largely through DNA denaturation
	all of these statements are TRUE
	refrigeration functions largely by reducing the metabolic rate of microbes
	psychrophiles are generally not effectively inhibited by refrigeration
	many bacteria can survive freezing for years at a time