12th Class Biology Sample Paper Practice Paper - 1

  • question_answer
    Direction: Read the following and answer the questions that follows.
    DNA is made up of millions of nucleotides. These are molecules composed of a deoxyribose sugar, with a phosphate and a base (or nucleobase) attached to it. These nucleotides are attached to each other in strands via phosphodiester bonds to form a 'sugar phosphate backbone'. DNA replication also known as semiconservative replication is the process by which DNA is essentially double. It is an important process that takes place within the dividing cell.
    DNA replication is semiconservative because

    A) Only one of the parent strands act as template

    B) Both the strands of the new molecule are synthesised de novo

    C) One of the strands in each molecule synthesised is parental and the other is new

    D) The daughter strands synthesised are dispersive

    Correct Answer: C

    Solution :

    One of the strands in each molecule synthesised is parental and the other is new


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