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Lipids usually consist of 3 fatty acids and 1 glycerol. I looked up what they look likeenter image description here

So how is it not a polar molecule? The $\ce{-OH}$ side has negative charge, and the hydrocarbon side chain has a positive charge.

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  • $\begingroup$ How do you get that the side chain has a positive charge? $\endgroup$ – jonsca Feb 22 '14 at 4:53
  • $\begingroup$ See Klaus's answer: Lipids are a class of biomolecule that are usually nonpolar or ambiphilic - they have a polar region (usually small, like the OH on cholesterol) and a nonpolar region (usually large, like the hydrocarbon part of cholesterol). $\endgroup$ – Ben Norris Feb 22 '14 at 13:53
  • $\begingroup$ Why was his question downvoted? $\endgroup$ – Brian Feb 22 '14 at 16:24
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Lipids usually consist of 3 fatty acids and 1 glycerol.

That's wrong. You're giving the definition of fats, which are just a subclass of lipids.

The structure in your question is the skeleton of cholesterol - without the stereochemistry.

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