Biochemistry help. Curvature of membranes may result from the shapes and Van der
ID: 219641 • Letter: B
Question
Biochemistry help.
Curvature of membranes may result from the shapes and Van der Waals envelopes of lipids. For example, relative sizes of polar head groups and non-polar fatty acid chains create a specific size and shape of a surrounding Van der Waals envelope. When lipids with these characteristics aggregate, their Van der Waals envelope will contribute toward a specific membrane curvature. Below are some examples of lipids that contribute toward membrane curvature. Based on the molecular drawings below, all three lipids seem to have very comparable polar-heads. Why does PE have a smaller polar-head than PC and LPC?
Answer choices:
1) The methyl-groups that are bonded to the nitrogen on PC & LPC are larger and have much smaller Van der Waals repulsive forces than the hydrogen atoms that are bonded to the nitrogen on PE. 1% ~?? 0 O OH O OH O OH o I 0 10 0 0 0 ?c 43Explanation / Answer
the methyl group of PC and LPC which are attached to the Nitrogen will have more Vander Waals repulsive forces as compared to the PE in which hydrogen is attached to the Nitrogen atom. so option 2 is correct.
The methyl-groups that are bonded to the nitrogen on PC & LPC are larger and have much greater Van der Waals repulsive forces than the hydrogen atoms that are bonded to the nitrogen on PE.
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