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Ma Microbes and Food

AS Biology flash cards for OCR

QuestionAnswer
Cooking Heat denatures enzymes and protiens killing the MO's.
Pasteurising Heating and cooling rapidly to kill MO's.
Salting Lowers the water potential outside the cell so water osmosies out of the MO cells.
Smoking The food develops a hardened, dry outer surface and the smoke contains anti-bacterial chemicals.
Pickling The acdic Ph denatures the enzymes wich kills the MO's.
Irradiation Ionising radiation denatures the DNA which kills the MO.
Cooling and Freezing Retard enzyme activity to stop them multiplying.
Canning The food is heated in an airtight can.
Vacuum Wrapping Air is excluded so microbes cannot respire.
Created by: thedexter102
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