Differentiate between exonuclease and endonuclease.

Explanation

`Endonucleases : They make cuts at specific positions within the DNA.
Exonucleases : They remove nucleotides from the ends of the DNA.
Detailed Answer:
Restriction enzymes belong to a class of enzymes called nucleases. The nucleases include exonucleases and endonucleases.
(i) Exonucleases
They remove nucleotides from the ends of the DNA.
(ii) Endonucleases
They cut at specific positions within the DNA. Each restriction endonuclease can bind to specific recognition sequence of the DNA and cut each of the two strands at specific points in their sugar-phosphate backbones.