After DNA fragments with matching sticky ends are temporarily joined by complementary base pairing, the union can be made permanent by the "pasting" enzyme
A)DNA ligase.
B)DNA polymerase.
C)DNA helicase.
D)ATP methylase.

Question

Quizplus · Accepted Answer

DNA ligase is the enzyme responsible for joining the sugar and phosphate backbones of the DNA strands that have been temporarily joined by complementary base pairing. It forms a covalent bond between the adjacent nucleotides, creating a permanent bond between the two DNA fragments. DNA polymerase is responsible for replicating DNA, but does not join DNA fragments together. DNA helicase unwinds the double-stranded DNA during DNA replication, but is not involved in joining fragments together. ATP methylase is not a known enzyme involved in DNA repair or replication.

After DNA Fragments with Matching Sticky Ends Are Temporarily Joined