MCQ
Starch is composed of two polysaccharides namely:
- AAmylopectin and glycogen.
- BAmylose and glycogen.
- CAmylose and amylopectin.
- DAmylose and amylopectin and glycogen.
Explanation:
Amylose and amylopectin are polysaccharides of starch. Starches are glucose polymers in which glucopyranose units are bonded by α-linkages.
It is made up of a mixture of amylose (15%-20%) and amylopectin (80%-85%).
Amylose consists of a linear chain of several hundred glucose molecules and Amylopectin is a branched molecule made of several thousand glucose units. Starches are insoluble in water.
They can be digested by hydrolysis, catalyzed by enzymes called amylases, which can break the α-linkages (glycosidic bonds).
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(Given: Atomic number: $V , 23 ; Cr , 24 ; Fe , 26;Ni , 28)$
$V ^{3+} \cdot Cr ^{3+}, Fe ^{2+}, Ni ^{3+}$
$C{{H}_{3}}OH\xrightarrow{HI}C{{H}_{3}}I\xrightarrow{KCN}$
$C{{H}_{3}}CN\xrightarrow{\text{reduction}}X\xrightarrow{HN{{O}_{3}}}Y$