Question

when biuret reagent is added to a solution containing protein, the solution turns pink or purple. in the absence of protein, the solution is blue. biuret reagent was added to solutions that may or may not contain protein. the data can be seen in the table below. what is the dependent variable in this experiment? tube a b c d result blue blue blue purple multiple choice the contents of the unknown solution whether or not biuret reagent is added to the solution the color change from blue to purple the ph of the solution

Explanation:

The dependent variable is what is being measured and is affected by the independent variable. In this experiment, the color change (blue - purple or remaining blue) is being measured as a result of adding the biuret reagent to the solution, which may or may not contain protein.

Answer:

The color change from blue to purple or remaining blue