Based on the data, was Zack, who ate the tofu, guilty of leaving a mess in the classroom?

Based on the data, was Zack, who ate the tofu, guilty of leaving a mess in the classroom? Answer is no

Sample Response: The mystery food sample did not test positive for protein using the Biuret indicator, so the sample can not be tofu, which is what Zack ate.

d. organisms have cells with different shapes and functions.