On the other side, nonpolar tails are hydrophobic or insoluble in water. The properties and structure of two representative lipids - both the stearic acid (which is a fatty acid) and the phosphatidylcholine (which is a phospholipid) are composed of chemical groups, which form polar "heads," nonpolar "tails." Here, polar heads are defined as hydrophilic or soluble in water. A few use the term 'Phospholipid' as a synonym for phospholipid, and others use it to denote a subgroup of phospholipids. The phospholipids, with the glycolipids, sphingolipids, and lipoproteins, are called complex lipids, as recognized from the simple lipids (waxes and fats) and from the other fat-soluble cell components, mostly steroids, and isoprenoids. It refers to any of a large class of fatlike and phosphorus-containing substances that play critical metabolic and structural roles in living cells. A phospholipid is also referred to as Phosphatide.
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