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Question

Which of the following properites of DNA polymerise necessitates the requirement of RNA primer in DNA replication?


A

It gets denatured at high temperatures.

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B

It can add a nucleotide only to a 5' end

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C

It can add a nucleotide only to a 3' end

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D

None of the above

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Solution

The correct option is C

It can add a nucleotide only to a 3' end


DNA polymerase can add a nucleotide only to a free 3'-end. Thus, to start the replication reaction a free 3'-end is provided by the RNA primer as there is no free 3-end available for adding the first nucleotide. RNA primer is a short segment of RNA synthesized at the 5' end of DNA. It gives free 3' end for the polymerase to elongate the DNA.


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