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Biomolecules — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules1 Mark
MCQ
Starch is composed of two polysaccharides namely:
  • A
    Amylopectin and glycogen.
  • B
    Amylose and glycogen.
  • ✓
    Amylose and amylopectin.
  • D
    Amylose and amylopectin and glycogen.
✓

Answer

Correct option: C.
Amylose and amylopectin.
Amylose and amylopectin are polysaccharides of starch. Starches are glucose polymers in which glucopyranose units are bonded by $\alpha -$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 $\alpha -$linkages $($glycosidic bonds$).$

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