Question

Which of following statement(s) about starch is/are true?

• A. Starch consist of two components,they are amylose and amylopectin.
• B. Amylose is the water insoluble component which consitutes
  80-85% of starch.
• C. Amylopectin is a water soluble component which constitutes 15-20% of starch
• D. In starch,$\alpha$-D-glucose units are linked by 1,4 -glycosidic linkages

Answer 1

Answer: (A), (D)

The correct options are
A Starch consist of two components,they are amylose and amylopectin.
D In starch,$\alpha$-D-glucose units are linked by 1,4 -glycosidic linkages

Starch is main storage system of plants. It is a polymer of $\alpha -$D-glucose, consists of two components called amylose and amylopectin.
Amylose is water soluble part constitutes 15-20% of starch and amylopectin is water insoluble part, constitutes 80-85% of starch.
It is a branched chain polymer of $\alpha -$D-glucose linked together by 1,4 -glycosidic linkages.