Biology 124L Fall

27 Jun Biology 124L Fall

Question
Biology 124L Fall 2014

Lab Report 1: Biological Macromolecules

1. What is the central question you addressed in the experiment that you conducted with your group’s experimental substance during this lab? (1pt)

2. List the four macromolecule tests used in this lab and describe what a positive result looks like. For each test, which control substance(s) should result in a positive test?

3. Which control substance(s) should produce a negative result for all four macromolecule tests? (1pt)

4. Explain why you ran each macromolecule test on four control substances (glucose, starch, oil, and protein) first, before testing your group’s assigned experimental substance. (1pt)

5. Name your group’s experimental substance. Write the hypotheses and predictions for each of the four macromolecule tests that you conducted on this substance. (1pt)

6. Describe the experiment you conducted with your group’s experimental substance. You do not need to list procedural details, but state which macromolecule tests you performed, and describe the initial and final color of substances in the test tubes. (1pt)

7. For each of the four tests, were the test results for your group’s experimental substance positive or negative? For each hypothesis regarding the experimental substance, describe the evidence for why your hypothesis was supported or not supported. (1pt)

8. What are possible sources of error that could have affected your results? How could you reduce the level of error if you repeated your experiments? (1pt)

9. How might these experimental methods be applied to address a question in the health or environmental sciences? (1pt)

10. Below are the results from a macromolecule test performed on several substances. Review the results. Which macromolecule test was being performed? What conclusions can be drawn about the experimental substance from these results? (1pt)

Material Tested

Color (initial)

Color (final)

Protein

blue

dark purple

Water

light blue

light blue

Oil (lipid)

light blue (separated)

light blue (separated)

Glucose (sugar)

light blue

light blue

Starch (polysaccharide)

light blue (cloudy)

light blue (cloudy)

Experimental substance (beef soup)

blue

light purple

Biology 124L Fall 2014

Lab Report 1: Biological Macromolecules: Answer Sheet

Please turn in only this answer sheet to your lab instructor. If your answers go beyond 1 page, please print the pages double-sided.

Due Date: The beginning of your scheduled lab section during the week of September 2nd.

Name: _________________________________________ Section: ____________________

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