Question 28 What is not a factor in altering thermal death point? O time organic matter...

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Answer 1

Answer #1

Ans1) MEDIA USED does not alter the thermal death point.

Explanation- Thermal death point is the lowest temperature at which all the microbes are killed by 10 minute exposure.

Different microbial characterstics determine temperature to be used to kill microbes.

Ans- 2) Mycobacterium is resistant to disinfectants due to- acid resistant cell wall.

Explanation- Mycobacterium has an outer waxy outer layer that makes it acid-fast bacterium and resistant to disinfectant.

Ans3) Alcohols cause protein denaturation and is effective against enveloped viruses.

Explanation- Ethyl alcohol is known to have virucidal activities.

Answer 2

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