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

Controlling microbes is critical for preventing disease spread.

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 microbes grow best below 20 degrees C? thermophiles mesophiles hyperthermophiles psychrophiles
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 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
What type of microbes can not be effectively killed by low temperature (i.e. freezing) treatment? methogens thermophiles mesophiles psychrophiles halophiles
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.
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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.
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
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Answer the question briefly and concisely. The Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes);nonhalophiles will not grow. Among the halophiles, mannitol fermenters will produce acid that turnsthe pH indicator yellow; mannitol nonfermenters leave the medium red. Onto MSA you inoculate ahalophilic mannitol fermenter and a halophilic mannitol nonfermenter. In this case, the medium isacting as (a) __________ medium(s).A. SelectiveB. DifferentialC. Selective and differentialD. Enriched

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	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