Question

the first step in the replication of dna is catalyzed by ______. ligase primase dna polymerase helicase single - strand binding protein

Explanation:

DNA replication begins with the unwinding of the double - stranded DNA. Helicase is the enzyme that catalyzes this first step by breaking the hydrogen bonds between the base pairs, thus separating the two strands. Ligase is involved in joining DNA fragments. Primase synthesizes RNA primers. DNA polymerase is for adding nucleotides to the growing DNA strand. Single - strand binding protein stabilizes the unwound single strands.

Answer:

helicase