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The colour would change to a purple, dark purple colour.

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โˆ™ 2011-02-13 20:40:42
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Q: What color is a postitive protein test?
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What color is a negative biuret test for protein?

A negative test would result in a color that is notviolet.


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What is indication of violet color in biuret test of enzymes?

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What color is a positive test for protein?

A positive test, when using Biuret reagent, would be purple-ish


What test could you use to determine whether an unlabeled test tube contain an amino acid or protein?

You could use a biuret test, because a positive result (signified by the presence of pink-violet color) indicates the presence of a protein with two or more peptide bonds. If such a protein is not present, the blue color of the cupric sulfate (which indicates a negative result) will remain.


If protein is present what color will appear after using the Biuret test?

If soluble protein is present the solution will turn from light blue to purple. if there is none there will be no reaction.


What color will a peptide bond be after using the Biuret test?

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