Question

Amylopectin is a polymer of:
(A) $\beta $ D glucose
(B) $\alpha $ D glucose
(C) $\beta $ D fructose
(D) $\alpha $ D fructose

Answer 1

Hint:

Amylopectin is a water soluble polysaccharide and highly branched polymer. It is one of the two components of starch, the other being amylose. Glucose units are linked in a linear way with $\alpha $ glycosidic bonds.

Complete step by step answer:
Starch is a colorless and odorless polysaccharide that is found in plants as stored carbohydrates. It is a polymer of glucose monomers that are linked with each other to form polysaccharide. It is composed of two types of polysaccharide molecules:
A. Amylose
B. Amylopectin
Now, we will discuss amylopectin.
Amylopectin is a polymer of several D-glucose molecules. $80\% $ of amylopectin is present in starch.
Further, the amylopectin molecules are linked by $\alpha 1,4$-glycosidic bonds and $\alpha 1,6 - $ glycosidic bonds. When iodine is added to starch, it gives reddish-brown appearance due to the presence of amylopectin. It readily dissolves in hot water.


Hence, option B is correct.

Note: Polysaccharides are large molecules that feature high molecular weights and contain hundreds of glucose units joined by $\beta $ glycosidic bonds between C-$1$ and C-$4$ sites of adjacent sugars. The most important polysaccharides are cellulose, starch and glycogen.