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Microbiology of Foods

Microbiology of Foods
Most spoilage bacteria grow at

any of the pH
acidic pH
alkaline pH
neutral pH

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Microbiology of Foods
Which of the following acid will have higher bacteriostatic effect at a given pH?

Tartaric acid
Citric acid
Acetic acid
Maleic acid

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Microbiology of Foods
Yeast and mould count determination requires-

nutrient agar
acidified potato glucose agar
violet Red Bile agar
MacConkey agar

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Microbiology of Foods
NaCl can act as

Both (a) and (b)
synergistically if added in excess of optimum level
None of these
antagonist at optimal concentrations

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Microbiology of Foods
A psychrophilic halophile would be a microbe that prefers

warm temperatures and increased amounts of pressure
cold temperatures and increased amounts of salt
warm temperatures and increased amounts of acid
cold temperatures and the absence of oxygen

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Microbiology of Foods
The time temperature combination for HTST paterurization of 71.1°C for 15 sec is selected on the basis of

B. subtilis
C. botulinum
E. coli
Coxiella Burnetii

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