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  4. An enzyme catalysing the removal of nucleotides from the ends of DNA is

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Q. An enzyme catalysing the removal of nucleotides from the ends of $DNA$ is

Biotechnology : Principles and Processes

Solution:

Exonucleases remove nucleotides from the terminal ends (either $5'$ or $3'$) of $DNA$ of one strand of duplex. Endonucleases make cut at specific position within the $DNA$. $DNA$ ligases are known as joining or sealing enzymes. Ligases form phosphodiester bonds between adjacent nucleosides and covalently link two individual fragments of $DNA$. Hind II is restriction endonuclease. It cuts the $DNA$ and produces blunt ends.