Which one of the following remove nucleotides from the ends of DNA or RNA?
A. Endonuclease
B. Exonuclease
C. S 1 nuclease
D. Deoxyribonuclease
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 lagases are known as joining or sealing enzymes.