Milk and Milk Products
Which of the following species of Clostridium is responsible for formation of dark green to black colours in cheese?

Clostridium sporogenes
Clostridium herbarum
None of these
Clostridium tyrobutyricum

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

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

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