Punjab Medical Punjab - MET Solved Paper-2010

  • question_answer
    Cellulose, the most important constituent of plant cell wall is made up of

    A)  branched chain of glucose molecules linked by`\[\alpha ,\,\,1,\,\,6-\]glycosidic bond at the site of branching

    B)  unbranched chain of glucose molecules linked by \[\alpha ,\,\,1,\,\,4-\]glycosidic bond

    C)  branched chain of glucose molecules linked by \[\beta ,\,\,1,\,\,4-\]glycosidic bond in straight chain and \[\alpha ,\,\,1,\,\,6-\]glycosidic bond at the site of branching

    D)  unbranched chain of glucose molecules linked by \[\beta ,\,\,1,\,\,4-\]glycosidic bond

    Correct Answer: D

    Solution :

    Cellulose\[{{({{C}_{6}}{{H}_{10}}{{O}_{5}})}_{n}}\]is the most abundant organic polymer. It is a polysaccharide and consists of long unbranched chains of glucose residues linked by \[\beta ,\,\,1,\,\,4-\]glycosidic bonds. In plants, cellulose is formed from sugar. It serves as a building material in the formation of cell wall.


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