Microbiology of Foods
Water activity can act as

an extrinsic factor
All of these
an intrinsic factor determining the likelihood of microbial proliferation
a processing factor

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Microbiology of Foods
Examination of the presence / absence of organisms refers to

incubation of a food suspension in an enrichment medium followed by inoculation on to a suitable selective medium.
incubation of a food suspension in an enrichment medium
None of these
incubation of a food suspension in an enrichment medium followed by inoculation on to a non-selective medium.

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