5. The effects of temperature and lipid composition on membrane fluidity are oft

Question

5. The effects of temperature and lipid composition on membrane fluidity are often studied by using artificial membranes containing only one or a few kinds of lipids and no proteins. Assume that you and your lab partner have made the following artificial membranes: Membrane 1: Made entirely from phosphatidylcholine with stearic acid as the fatty acids. Membrane 2: Same as membrane 1, except that each of the fatty acids is oleic acid. Membrane 3: Same as membrane 1, except that each of the fatty acids is elaidic acid. rmining the transition temperatures (m) of samples representing each of the membranes, Aft t your lab partner failed to record which membranes the samples correspond to. The three values you determined are 69.6°C, 13.4°C, and 45.3°C. Assign each of these transition temperatures to the correct artificial membrane above. (3 pt

Explanation / Answer

Membrane 1 has long and saturated fatty acid so it has highest temprature ( 69.6°C ).

Membrane 2 has double bond, which disrupt the phospholipid packing in the membrane. Therefore membrane 2 acquire lower temp. ( 13.4°C ).

In Membrane 3 the shortest tail of fatty acid will over the transition temp.noticeably but not enough.Therefore membrane 3 acquire intermediate transition temp. (45.3°C ).

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