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  5. Molecular basis of Inheritance / विरासत का आणविक आधार

12th Class Biology Molecular basis of Inheritance / विरासत का आणविक आधार Question Bank MCQs - Molecular Basis of Inheritance

  • question_answer
    A nucleoside differs from a nucleotide. It lacks the    

    A) base                 

    B) sugar

    C) phosphate group            

    D) hydroxyl group

    Correct Answer: C

    Solution :

    [c] A nitrogenous base is attached to the pentose sugar by an N-glycosidic linkage to form a nucleoside, i.e. Nucleoside=Nitrogen base + Pentose sugar. When a phosphate group is attached to the 5'-OH of a nucleoside through phosphodiester linkage, a nucleotide is formed, i.e. Nucleotide = Nitrogen base + Pentose sugar + Phosphate \[\left( P{{O}_{4}} \right)\]. So, a nucleoside differs from a nucleotide as it lacks phosphate group.


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