Rubric for Identifying Organic Molecules  (21 points)

Title: Must be descriptive (includes the IV and DV of the experiment) 1 point


Data Table of class results:  (8 points total)

a. includes a descriptive title (remember you can most likely use the regular title again).(1 point)

b. only one horizontal line between the column headings and the data  (column headings include the name of the indicator and what the indicator detects in parenthesis... example: Benedict's Solution (monosaccharides)... (5 points)

c. Key for explaining the symbols you might use... example "+" = positive; also and colors or changes that a positive test indicates (example: Benedict's solution positive test includes a green, red, orange, or yellow solid) (2 points)

Post Lab Questions  make sure you pick one version of questions to answer and provide any citations requested for full credit. Also remember incomplete sentences, sentences starting with "it" or "because", or sentences using pronouns will not receive credit and you will be asked to redo the assignment.

Answer questions  1-6 to earn a C on this section: (6 points), answer questions 6-10 to earn a B (8 points), to earn an A (up to 12 points answer 6-11).

  1. Why is a monosaccharide called a monomer?

  2. Why is a polysaccharide called a polymer?

  3. List which chemical detects which molecule.

  4. A lipid refers to three different types of substances, a _____________, a _____________ and __________.

  5. Why is water a good substance for a control in this lab activity?

  6. Describe the evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules. (If you choose to use diagrams, make sure you explain what those diagrams are illustrating).

  7. People with diabetes are instructed to avoid foods that are rich in carbohydrates.  How could the lab observations in this investigation help with the decision whether a food should be served to a person with diabetes?  ( explain the relationship between diabetes, insulin, and monosaccharides and the connection to this lab activity... include citations to references. Use a superscript.) (2 points)

  8. What conclusion could be make if a positive test for any of the organic compounds occurred in the distilled water?  (what is in distilled water normally... what could the source of this "positive" test come from during the lab testing process). (2 points)

  9. Why can’t Biuret’s reagent be used to test for amino acids? (what does Biuret's actually detect on a  protein, what is the relationship between an amino acid and a protein? cite your sources at the end of your answer. Use a superscript.) (2 points)

  10. The leaves of many plants are coated with a waxy substance that causes them to shed water.  What would Sudan IV do when dropped on the leaf?  ( what type of biomolecule is detected by Sudan's what is the relationship to wax... what is the name of the waxy substance... cite your sources at the end of your answer.Use a superscript.) (2 points)

  11. In winter, plants exchange the saturated lipids in their cell membranes for unsaturated lipids.  Unsaturated lipids are “bent” and keep the membranes more fluid, or pliable, because they cannot be stacked closely together.  What advantage would this change be for green stemmed (herbaceous) plants that live through the winter?  (Hint: what happens to bacon grease or the grease on top of chicken soup when  put in the refrigerator?) ( Which is a liquid at room temperature, a solid at room temperature.. why would a plant want to switch the types of fatty acids in the winter... what could happen if the cell membrane only had saturated fatty acids during the winter, or only unsaturated fatty acids in the summer... don't forget to cite your sources properly at the end of your answer.Use a superscript.)_(3 points)

Helpful articles to answer #10 article #1  (Especially see section F)

Use correct format for references. Go to Son of Citation or Bibme and use APA format.