Microbiology of Foods
NaCl can act as

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

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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
incubation of a food suspension in an enrichment medium followed by inoculation on to a suitable selective 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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