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| Column-$I$ | Column-$II$ |
|---|---|
| $(a)$ Ligase | $(i)$ It removes nucleotides from $DNA$ ends. |
| $(b)$ Endonuclease | $(ii)$ Connects parts of $DNA$. |
| $(c)$ Exonuclease | $(iii)$ Removes phosphates from $DNA$. |
| $(d)$ $DNA$ Polymerase | $(iv)$ It produces sticky ends in $DNA$. |
| $(v)$ Useful for repeated amplification. |
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