Neet Solved Paper 2013 Question 14
Question: A phosphoglyceride is always made up of
Options:
A) only a saturated fatty acid esterifies to a glycerol molecule to which a phosphate group is also attached
B) only an unsaturated fatty acid esterifies to a glycerol molecule to which a phosphate group is also attached
C) a saturated or unsaturated fatty acid esterifies to a glycerol molecule to which a phosphate group is also attached
D) a saturated or unsaturated fatty acid esterifies to a phosphate group, which is also attached to a glycerol molecule
Show Answer
Answer:
Correct Answer: C
Solution:
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 to glycerol by an ester linkage.
A fatty acid has a long carbon skeleton, usually 16 or 18 carbon atoms in length.
It 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 alcohal glycerol.
The fatty acids are attached to the glycerol at the 1 and 2 position on glycerol through ester bonds.
