Milk and Milk Products
A brown color in milk may result from

S. marcescens
Pseudomonas putrefaciens
both (a) and (b)
the enzymatic oxidation of tyrosine by P. fluorescens

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Milk and Milk Products
The acidity may be described as "aromatic" when

Lactic streptococci and aroma forming Leuconostoc species are growing together
All of these
appreciable amounts of volatile fatty acids are produced by Coliform bacteria
Streptococcus lactis and other lactis are growing together

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Milk and Milk Products
Non bacterial ropiness or sliminess in milk and milk products may be due to the

All of these
sliminess resulting from the thickness of the cream
stringiness caused by mastitis and in particular by fibrin and leucocytes from the cow's blood.
stringiness due to thin films of casein or lactalbumin during cooling

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