Question

click each test tube to test for the presence of proteins. record all color changes in the data table. the mystery food sample does not contain protein because the color of the test tube was pink/purple, not pink/purple. done biuret solution gelatin water mystery food sample

Explanation:

The Biuret test is used to detect proteins. A positive result (presence of protein) is indicated by a pink - purple color change. Since the mystery food sample did not turn pink - purple, it does not contain protein.

Answer:

The mystery food sample does not contain protein because the color of the test tube was not pink/purple.