You tested for the presence of four different indicators✔ nutrientscolor changes by adding
If the mystery food sample contained the nutrient, then it would change to the same color as the indicator.✔ positive control.negative control.
You tested for the presence of four different by adding to the three test tubes.
Select question dadd78e5
Based on the data, was Zack, who ate the tofu, guilty of leaving a mess in the classroom? yes✔ no
The data above indicate an error. How do you know? What might have caused the error?
Water is a negative control and should not test positive for protein, meaning it should have remained blue (the color of the Biuret reagent) rather than turning pink or purple. This error indicates that the sample was likely contaminated with protein or that the test tube was mislabeled.
What is the name of the glass container above that you used to heat water?
lemon juice✔ meatmilk
Justify your answer.
The mystery food sample did test positive for Sudan red. Nicole ate salad dressing, which contains fat, a lipid. She is the likely culprit.
Justify your answer.
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.
Why was a beaker used for heating the solution?
Which possible errors did you include in your response? Check all that apply.
✔ olive oilorange juicebleach
Check all facts below that you included in your explanation.
Check all facts below that you included in your explanation.
Select question bcca6abd
sulfuric acidammonia✔ tomatoes
To determine if the substance in the first test tube above is indeed a meat, you could also test it using ✔ Biuret solution.Lugol's solution.Benedict's solution.Sudan red.
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