Question

Mention the difference in the mode of action of exonuclease and endonuclease.

Answer 1

The difference between exonuclease and endonuclease is that

Endonucleases are nuclease enzymes that catalyze the hydrolysis of nucleic acids, but they only break internal phosphodiester bonds, they don't recognize terminal nucleotides as substrates.

Exonucleases are enzymes that cleave the nucleotides at the end of the DNA molecule.