Are unsaturated fats hydrophilic or hydrophobic? Fatty acids are long-chain hydrocarbons with a carboxylic acid functional group. Their relatively long nonpolar hydrocarbon chains make them hydrophobic. Fatty acids with no double bonds are saturated; those with double bonds are unsaturated. Are unsaturated lipids hydrophilic? Biological membranes remain fluid because of the unsaturated hydrophobic tails, which prevent phospholipid molecules from packing together and forming a solid. The formation of a micelle is a response to the amphipathic nature of fatty acids, meaning that they contain both hydrophilic and hydrophobic regions. Are phospholipids hydrophilic? Phospholipids are amphiphilic molecules with hydrophobic fatty acid...