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Question 3 Which of the following bacteria do we expect to have the highest TDT? Answer saved Points out of 2.00 P Flag quest
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Ans) B. cereus will be having highest TDT (Thermal death time) because it is spore forming bacterium and the spores are extremely heat resistant and usually takes longer time to get killed or inactivated. Other spore forming bacteria are Clostridium sp. (Commonly found in canned foods) , B. stearothermophilus etc are heat resistant and thus has higher TDT. Thermophile bacteria also has higher TDT like Thermus aquaticus,Thermococcus litoralis (Source of Taq DNA polymerase used in the PCR to resist high temperatures) etc.

E.coli is mesophile and usually grows at around 37 o C and can get killed easily. S.aureus and S.epidermidis also are inactivated at lower TDT.

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