mod03MacromoleculesLifeLabReport.docx

mod03MacromoleculesLifeLabReport.docx - Laboratory Report...

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Laboratory Report Sheet: Macromolecules of Life Exercise 1: Testing for Proteins Data Table 1: Biuret Results (1 point) Substance Tested Predicted Results Biuret Color & number of Drops Added 1: Egg White Foam up 5 drops the top layer turned light purple 2.:Pepsin Foam or Become Fizzy 5 drops all turned light purple 3: Sugar Sugar would crystalize Nothing 4: Distilled Water Separate the two No change *Insert a digital image of the Biuret Results here. (4 points) 1 Adapted with permission from Labpaq/Hands-On Learning
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Questions: (1 point) A. Which of the test tubes are the positive and negative controls? Sugar with water and water were negative and the egg whites , pepsin positive. B. What conclusions can be made about the experiment? The egg white and pepsin react to biuret while sugar and water doesn’t. C. How might Biuret reagent be used in a practical real-life situation? By testing other ingredients with it in small doses. D. How did the predicted results compare to the actual results? Just a little but I thought that the pepsin and the biuret would have a different reaction because they are more uncommon items, and for the egg white I expected it to be fizzy because of the consistency of egg whites. Exercise 2: Testing for Sugars Data Table 2: Benedict’s Reagent Results (1 point) Test sample Predicted Results Benedict’s Results #1 Glucose Glucose might separate from water. Clear bright blue. #2 Starch Turn brown because potatoes turn brown when left on cutting board.
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