Toxins from pathogenic bacteria can be destroyed by freezing and cooking true or false

Toxins from pathogenic bacteria can be destroyed by freezing and cooking - This is FALSE.

Further Explanation

Freezing cannot destroy pathogenic bacteria and the toxins they produce. It can only make pathogenic bacteria inactive thus making the bacteria unable to produce toxins. Therefore, when food placed into the freezer is already contaminated then thawed, it will harbor the same harmful bacteria. Most bacteria are inactive at temperatures below 40 °F.

Cooking. Although cooking can destroy the bacteria, the toxin produced is heat stable and may not be destroyed. Staphylococcus aureus is known to produce toxins that are heat-stable. Enteropathogenic E. coli is capable of producing toxins that are heat stable and toxin that are heat-sensitive. Certain bacteria like Clostridium and Bacillus spp exist as spore and are heat resistant thus making them survive cooking temperature.  

Danger zone. The range of temperature in which most pathogenic bacteria grow is between 40 °F and 140 °F.

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Keywords: pathogenic bacteria, toxins

The statement is false because certain toxins can survive the heat and freezing temperatures.

Further explanation:

Sterilization is basically the process which removes, kills, and completely eliminates all forms of life which include fungi, viruses, bacteria, and spores. There are different kinds of sterilization techniques which are used in the laboratory and can be attained by the combination of chemicals, heat, high pressure, irradiation, and filtration such as steam, dry heat, and gas.

The toxins from pathogenic bacteria are unable to destroy by cooking or freezing. This is because the process of cooking might kill certain bacteria if the temperature is high for a longer period of time, however, the toxins generated by certain bacteria might be heat stable and may survive the heat.

Similarly, freezing might kill certain bacteria, however, it cannot depend upon the destruction of the bacterial toxins. Freezing of foods might not destroy bacterial toxins, but it might destroy certain bacteria.

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Answer details:

Grade: High School

Subject: Biology

Chapter: Sterilization

Keywords:

Sterilization, heat, bacteria, freezing, cooking, radiation, toxin, pathogenic, destroy, destruction, high pressure, irradiation, filtration.

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