Two strands of DNA that have been cut by an endonuclease can be sealed together by a(n)
A)polymerase enzyme.
B)ligase enzyme.
C)exonuclease enzyme.
D)protease enzyme.
E)methylase enzyme.

Question

Quizplus · Accepted Answer

Ligase is the enzyme that catalyzes the formation of phosphodiester bonds in the sugar-phosphate backbone of DNA molecules. Therefore, it is responsible for sealing two strands of DNA together that have been cut by an endonuclease. Polymerase enzymes catalyze the synthesis of new DNA strands, exonuclease enzymes catalyze the removal of nucleotides from the ends of DNA strands, protease enzymes catalyze the breakdown of proteins, and methylase enzymes catalyze the addition of methyl groups to DNA.

Two Strands of DNA That Have Been Cut by an Endonuclease