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Q.

Which of the following is an incorrect statement regarding the enzymes used for recombinant DNA technology?

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a

DNA ligase helps in sealing gaps and acts as molecular glues.

b

Reverse transcriptase is used to from cDNA from mRNA.

c

DNA polymerase removes phosphate groups from the 5' end of double-stranded DNA and prevents unwanted ligation.

d

Restriction endonucleases open the vector by breaking the phosphodiester bond between two nucleotides of a specific sequence. 

answer is C.

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Detailed Solution

DNA polymerases do not remove phosphate groups from 5' end of nucleic acid strands. They usually attach nucleotides to 3' end of the preexisting nucleotides over the template.

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