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Question Video: Drawing Conclusions About Experimental Results of a Biuret Test Biology

Two samples of food have been tested with the biuret test. What is the biological molecule contained in sample Y, according to the demonstrated results?

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Video Transcript

Two samples of food have been tested with the biuret test. What is the biological molecule contained in sample Y, according to the demonstrated results?

The question asks us about a test to determine the composition of two samples of food. Scientists have created several tests to determine if certain foods contain biological macromolecules, such as proteins, lipids, or carbohydrates. In this example, we are presented with two samples of food that have been analyzed using the biuret test.

To perform the biuret test, food samples are crushed and added to a test tube. Then, a few drops of biuret solution are added to the test tube. The test tube is then carefully shaken to ensure that the solution is mixed thoroughly. Finally, the sample is observed. If protein is present in the food sample, the solution will turn from blue to purple. However, if no protein is present in the sample, the solution will remain blue.

Now that we have reviewed the biuret test, we can identify what biological molecule is contained in sample Y. In the biuret test, a purple color signifies that the sample contained protein.

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