Microbiology
The elimination of the scum of yeasts in the brine during the fermentation include

agitation of the surface
all of these
addition of the sorbic acid
addition of the mustard oil

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Microbiology
Which of the following is true to prevent botulism from smoked fish?

The fish should be heated at its coolest part to at least 82°C for 30 min during or after smoking
Good sanitation should be maintained throughout production and handling
All of these
Fish should be immediately frozen after packaging and kept frozen

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