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

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

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

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

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