Question

Amylopectin is a polymer of
(A) $\alpha -D$ glucose
(B) $\alpha -D$ fructose
(C) Lactose
(D) Amylose

Answer 1

Hint: Polymer is a substance consisting of a large number of molecules or macromolecules and composed of many repeating units.
Example. silk, wool, DNA, cellulose, proteins are all natural polymers.

Complete step by step answer:
Amylopectin is polysaccharide and a highly branched polymer. They are found in plants.
Amylopectin is one of the two important components of starch. It is water soluble.
The repeating unit in Amylopectin is $\alpha -D-$ glucose.
$\alpha -D-$glucose units are linked in a linear way with $C_1\to C_4$ glycosidic bonds.
A glycosidic linkage is a covalent bond that allows the linking of two monosaccharides together.
Amylopectin contributes about 80% of starch $\alpha -D-$ glucose linked $C_1-C_4$ atoms through glycosidic linkage branching occurs by the formation of glycosidic linkage between$C_1$ of one$\alpha -D-$ glucose and $C_6$ of another $\alpha -D-$ glucose unit.

 Linkage between two monosaccharide molecules through oxygen is called glycosidic linkage.

Therefore, by the above explanation, the correct option is [A]

Note: Polysaccharides have a large number of same or different monosaccharides, linked together by glycosidic linkage. They have molecular formula $(C_6{H}_{10}{O}_5{)}_n$
Another part of starch is Amylose. This is a water soluble part of starch.