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Biomolecules — Chemistry STD 12 Science — Question

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

Answer

  1. Amylose and amylopectin.

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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