SCI260 – Introduction to Biochemistry

Lesson 6 1. Describe (in words) the overall structure of a lipid bilayer. 2. What are the properties (i.e., characteristics) of the lipid bilayer of a cell that make it impermeable to ions and most molecules? 3. Describe the role of cholesterol in maintaining the fluidity of the lipid bilayer of a cell? 4. The triglycerides in animals tend to be solids (i.e., fats) at room temperature whereas the triglycerides in plants tend to be liquids (i.e., oils) at room temperature. Based on this fact, what can you conclude about the characteristics of the fatty acids in animal triglycerides compared to the fatty acids in plant triglycerides? 5. Peanut oil contains a high percentage of monounsaturated triglycerides whereas vegetable oil contains a higher percentage of polyunsaturated triacylglycerols. A bottle of peanut oil and a bottle of vegetable oil are stored in a pantry with an outside wall. During a cold spell, the peanut oil freezes, but the vegetable oil remains liquid. Explain why. 6. How many molecules of ATP are generated when stearic acid (i.e., stearate), an 18-carbon saturated fatty acid, is completely oxidized via the beta-oxidation pathway in the mitochondria? a) 112 b) 129 c) 146 d) 163 7. Which of the following fatty acids below are essential for humans? *Select one or more. a) Oleic acid b) Linoleic acid c) Linolenic acid d) Palmitoleic acid e) Eicosapentaenoic acid (EPA) 8. Refer to Question 7, look up the structures of each fatty acid that is essential and explain why they are essential for humans? 9. Are trans fatty acids saturated or unsaturated? 10.Provide four (4) examples of foods that contain trans fatty acids. You may use your textbook and/or the internet to assist you. You will earn 10 points for correctly answering each question (maximum points earned = 100 points).

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ADDITIONAL INSTRUCTIONS FOR THE CLASS

Discussion Questions (DQ)

Initial responses to the DQ should address all components of the questions asked, include a minimum of one scholarly source, and be at least 250 words.
Successful responses are substantive (i.e., add something new to the discussion, engage others in the discussion, well-developed idea) and include at least one scholarly source.
One or two sentence responses, simple statements of agreement or “good post,” and responses that are off-topic will not count as substantive. Substantive responses should be at least 150 words.
I encourage you to incorporate the readings from the week (as applicable) into your responses.

Weekly Participation

Your initial responses to the mandatory DQ do not count toward participation and are graded separately.
In addition to the DQ responses, you must post at least one reply to peers (or me) on three separate days, for a total of three replies.
Participation posts do not require a scholarly source/citation (unless you cite someone else’s work).
Part of your weekly participation includes viewing the weekly announcement and attesting to watching it in the comments. These announcements are made to ensure you understand everything that is due during the week.

APA Format and Writing Quality

Familiarize yourself with APA format and practice using it correctly. It is used for most writing assignments for your degree. Visit the Writing Center in the Student Success Center, under the Resources tab in LoudCloud for APA paper templates, citation examples, tips, etc. Points will be deducted for poor use of APA format or absence of APA format (if required).
Cite all sources of information! When in doubt, cite the source. Paraphrasing also requires a citation.
I highly recommend using the APA Publication Manual, 6th edition.