Question

The nuclease enzyme which begins its attack from free end of a polynucleotide is

• A. Exonuclease
• B. Kinase
• C. Polymerase
• D. Endonuclease

Answer 1

The correct option is A Exonuclease

• The enzyme which can attack the free or the external end of the long polynucleotide chain is known as an exonuclease.
• These are the type of nuclease enzymes which can attack on the free 3' or the 5' end of the nucleotide sequence.
• These enzymes can cleave the phosphodiester bonds on either side of the nucleotide chain.

Thus, the correct answer is option A.