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Is the following positive in a biuret test? a. skim milk b. purified casein c. purified...

Question:

Is the following positive in a biuret test?

a. skim milk

b. purified casein

c. purified lactose

d. dextrose

Biuret's Test:

Biuret's Test is a qualitative test used to determine the presence of peptide bonds in a substance. Therefore, Biuret's Test gives positive results for substances containing proteins.

Answer and Explanation:

While skim milk is milk without fat, there is still protein in it. Casein is a type of protein. Lactose and dextrose are sugars.

Therefore, choices A and B will give positive results in Biuret's Test.


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