Multiple Choice
Which of the following microbial control methods does not actually kill microbes or inhibit their growth but instead removes them physically from samples?
11. Controlling Microbial Growth
Review of Physical Methods to Control Microbial Growth
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Which method of physical microbial growth control requires extremely high temperatures and long periods of time to kill microbes?
A
Moist heat control techniques.
B
Pasteurization.
C
Dry heat control techniques.
D
Lyophilization.
Verified step by step guidance1
Understand the concept of microbial growth control, which involves methods to inhibit or kill microorganisms to prevent their spread or contamination.
Recognize that physical methods of microbial control include techniques like heat, filtration, and radiation.
Differentiate between moist heat and dry heat control techniques. Moist heat involves steam or boiling water, which is effective at lower temperatures and shorter times due to better heat penetration.
Identify dry heat control techniques, which require higher temperatures and longer exposure times. This method is effective because it oxidizes cell components and denatures proteins, leading to microbial death.
Consider examples of dry heat control techniques, such as incineration or hot air ovens, which typically operate at temperatures around 160-170°C for periods of 2 hours or more to ensure effective sterilization.
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