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 conclusion can be drawn from this data? tube a b c d result blue blue blue purple tube d contains water, while tubes a, b, and c contain protein. tube d contains protein, while tubes a, b, and c contain water. tube d contains protein, while tubes a, b, and c do not. tube d does not contain protein, while tubes a, b, and c do. multiple choice

Explanation:

The biuret reagent turns pink or purple in the presence of protein and remains blue in its absence. Tubes A, B, and C have a blue result, indicating no protein. Tube D has a purple result, indicating the presence of protein.

Answer:

Tube D contains protein, while tubes A, B, and C do not.