Review 5 with answers. Lipid membranes

Review 5 with answers. Lipid membranes - Fatty acid...

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Fatty acid metabolism * disclaimer, the exam for this section has not been made, and while I may hint at what MIGHT be good exam questions, there are six other people that must agree with me on these questions so they may or may not appear on the exam. It however would be a good idea to know them anyway Class notes: 1) Do lipids, or protein carry out most membrane functions? a. Proteins. – Schacht lct 19 sld. 1 2) when shown a fatty acid. Determine which part is the fatty and which part is the acid a. The carboxylic part is the acid, the carbon chain is the fatty part. – Schact lct 19 slide 4 3) Describe the naming scheme of fatty acids, both from the fatty end and from the acid end. Know the notation. i.e C18:1, C18 Δ9 means. What does an n- mean? How do you know how many double bonds there are based on the name? (a possible exam question would be ‘name this fatty acid’ a. Coming from the acid, side. The C with the carbonyl (C=0) is labeled as 1. The carbon next to it is name alpha (carbon #2) . When named from the end, the carbons are named as omega 1, omega 2. ways to name a fatty acid are either by it’s name i.e palmitate. You can label it as C(# of Carbons including the one with the carbonyl) : (# of double bonds) or you can label it as C(number of carbons including the one with the carbonyl) delta (triangle) the carbon AFTER which the double bond is found counting from the carbonyl. – Schact lct 19 sld 5 b. n- stands for unbranched. An enoic acid means one double bond, and dienoic acid means 2 double bonds Schact lct 19 sld 7 4) What two things determine the fluidity of a membrane? How is the melting point affected by these qualities? a. The fluidity of a fatty acid depends on the chain length – longer chain lengths means high melting points, and therefore less fluid, and more rigid. Shorter chains means a lower melting point and therefore more fluid b. Degree of saturation (# of double bonds). Fatty acids with more double bonds (less saturation or ‘unsaturated’) have lower melting points and are therefore more fluid. Schact lct 19 sld 8 5) Whats the difference between cis and trans fatty acids? Which ones are normally found in you body? Why are trans fatty acids bad for you? a.
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This note was uploaded on 11/14/2009 for the course BIOLCHEM 415 taught by Professor Michaeluhler during the Winter '06 term at University of Michigan.

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Review 5 with answers. Lipid membranes - Fatty acid...

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