If the casein in the milk is hydrolyzed it will lose its opaqueness.
Therefore, if the bacteria have the exoenzyme capable of casein hydrolysis, there will be a clear zone around the bacterial growth. If the organism lacks the exoenzyme to break down casein the skim milk agar will remain white and opaque.
When protein are hydrolyzed, milk's proteins like casein are broken down into amino acids. The allergenic reaction of the milk's proteins are changed due to this.
Milk. In milk, the proteins are too large to dissolve. They are actually suspended within the solution.
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Milk is a mixture, as it contains many different compounds (proteins, fats, sugars, etc.) dissolved/suspended in water.
All natural milk contains proteins.
Not all of it, milk contains sugars, proteins and fats.
The proteins denature and tend to clump together and do what is called curdling. This is how cottage cheese, among other milk products, is made.
Milk
Proteins from milk are precipitated.
Milk proteins are Whey and Casein.
proteins
Simply put "a perminent distribution of the substance in the solvent". Colloids don't really form true solutions like sodium chloride does with water. Think of "Milk" as a great example. Water, Fats, and Proteins all get mixed together to make milk. The fats and proteins don't really get broken down, just kind of suspended in the mix.