NEET Zoology Biomolecules Questions Solved

NEET - 2013

A phosphoglyceride is always made up of

(a) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(b) only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(c) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(d) a saturated or unsaturated fatty acid esterified to a phosphate group, which is also attached to a glycerol molecule.

(c) A fat is formed of two kinds of smaller molecules, i.e, glycerol, and fatty acids. In making a fat, three fatty acid molecules each join o glycerol by an ester linkage. A fatty acid has a long carbon skeleton, usually 16 or 18 carbon atoms in length. If there are no double bonds between carbon atoms composing the chain, then as many hydrogen atoms as possible are bonded to the carbon skeleton. This is called saturated fatty acid. Unsaturated fatty acid has one or more double bonds. Phosphoglycerides are esters of two fatty acids, phosphoric acid, and a trifunctional alcohol glycerol. The fatty acids are attached to the glycerol at the 1 and 2 positions on glycerol through ester bonds.

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