# What is the structure of a lipid and why is this example non-polar?

Lipids usually consist of 3 fatty acids and 1 glycerol. I looked up what they look like

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

• How do you get that the side chain has a positive charge? – jonsca Feb 22 '14 at 4:53
• 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). – Ben Norris Feb 22 '14 at 13:53
• Why was his question downvoted? – Brian Feb 22 '14 at 16:24