Question

phosphatidic acid is composed of
glycerol and 2 fatty acids
phosphoric acid
both a and b
fatty acid and 2 glycerols
​

Answer 1

Answer:

Phosphoglycerides

Phosphoglycerides (also called glycerophospholipids) are the main constituents of membrane bilayers (Fig. 13.2). (These lipids are often called phospholipids, an imprecise term, as other lipids contain phosphate.) Phosphoglycerides have three parts: a three-carbon backbone of glycerol, two long-chain fatty acids esterified (or attached via an ether link in Archaea) to hydroxyl groups on carbons 1 and 2 (C1 and C2) of the glycerol, and phosphoric acid esterified to the C3 hydroxyl group of glycerol. Most also have an alcohol head group esterified to the phosphate. Fatty acids have a carboxyl group at one end of an aliphatic chain of 13 to 19 additional carbons (Table 13.1). More than half of the fatty acids in membranes have one or more double bonds.

Explanation: