Lipids and Biomembranes

ID #1079

I understand how unsaturated bonds in the phospholipids alters the whole phospholipid in the 3-d structure. But I remember that in the little movie that we watched in lecture, it said that this is mainly caused if the double bond is in cis-configuration. So, what would happen if the double bond was in trans-configuration? or is it even possible?

Good question, but for those of you reading along, this won't be on your exam. Yes, a trans double bond is chemically possible, but the 3-D consequence is that the tail stays relatively straight. So if the purpose of incorporating double bonds is to adjust your fluidity, it doesn't make much sense for the cell to introduce trans double bonds. And since cells don't generally do things that don't make sense....

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