Zack could not have made the mess because he ate Tofu which contains proteins.
Zack brought Tofu to the classroom and it contains protein.
The unknown food sample was tested for protein by:
- using a biuret reagent
- checking to see if the solution would turn pink/purple
The unknown food sample did not turn pink/purple so it did not contain proteins which is what Zack had in his tofu.
In conclusion, Zack could not have made the mess because the test did not indicate the presence of protein in the mess.
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