lipid-membrane proteins practice problems key

lipid-membrane proteins practice problems key - see on the...

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Membranes: Lipid and Membrane Proteins Practice Problems Key From the Book: Biochemistry 6 th edition , Chapter 12 Problems: 4, 6, 7, 9, 11, 13 Answers in the back of the book Then try these: 1. Coconut oil is solid at room temperature while olive oil is liquid. What types of fatty acids would you expect to find in each oil and why? Coconut oil is composed primarily of saturated fatty acid chains. The Tm is higher than 25 °C and thus it is solid at room temperature. Olive oil is composed primarily of unsaturated fatty acid chains. The Tm of this oil is lower than 25 °C, and thus is liquid at room temperature. Note: Both olive oil and coconut oil are mixtures are several different, chemically distinct, oils. 2. Are the ω - 3 fatty acids in commercially available fish oil tablets saturated or unsaturated? Explain your answer. ω - 3 fatty acids are unsaturated by definition 3. You are eating in a “trans fat free” restaurant in Manhattan and you the first thing you
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Unformatted text preview: see on the menu is a bacon, lettuce, and tomato sandwich. Can they serve that and still comply with the ban on trans fats? Why or why not? Yes, “trans fat” bans cover unsaturated fatty acids in the trans conformation. Most (but not all) trans fatty acids are synthesized as a side reaction during the hydrogenation of unsaturated oils, a relatively common food processing technique. (Note: “Trans fat” bans are not absolute and vary from state to state.) 4. Compare and contrast the biochemical basis of membrane fluidity in animal cells to that of prokaryotic cells. Membranes transition from the fluid (biological active) state to a rigid state at their phase transition temperature (Tm). In order to exist in different environments, cells must regulate their fluidity. Animal cell membrane fluidity is regulated by concentration of cholesterol. Prokaryotic cell membrane fluidity is regulated by the composition of fatty acid chains. 5. Not covered this year....
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This note was uploaded on 05/06/2010 for the course BIOC 460 taught by Professor Ziegler during the Spring '07 term at Arizona.

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