NEET 2018 · ChemistryPolysaccharidesPrevious Year Question

The difference between amylose and amylopectin is:

Answer: (C) Amylopectin is branched, having both -() and -() linkages, whereas amylose is linear with only -() linkages. \textbf{Answer:} (C) Amylopectin is branched (both and links); amylose is linear (only ).

  1. A.Amylose is a branched polymer with -() and -() glycosidic linkages
  2. B.Amylose has both -() and -() linkages while amylopectin is linear
  3. C.Amylopectin is branched, having both -() and -() linkages, whereas amylose is linear with only -() linkages
  4. D.Amylose is a copolymer made up of glucose and galactose units

Correct Answer

(C) Amylopectin is branched, having both -() and -() linkages, whereas amylose is linear with only -() linkages

Solution & Explanation

\textbf{Answer:} (C) Amylopectin is branched (both and links); amylose is linear (only ). \textbf{Solution:} Both amylose and amylopectin are polymers of -D-glucose, so option D (glucose galactose) is wrong. Amylose is a long unbranched chain containing only -() glycosidic linkages, which rules out option B (amylose is not branched) and option A (amylose is not the branched form). Amylopectin is highly branched: its linear segments use -() linkages while the branch points are joined by -() linkages. The distinguishing feature is therefore that amylopectin has both and linkages whereas amylose has only — option C.

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