Milk and Milk Products
Bacterial ropiness in milk is caused by

slimy capsular material from the cells usually proteins
All of these
slimy capsular material from the cells usually lipids
slimy capsular material from the cells usually gums or mucins

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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
appreciable amounts of volatile fatty acids are produced by Coliform bacteria
All of these
Streptococcus lactis and other lactis are growing together

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