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before DNA replication can occur the double stranded DNA must first

Sagot :

RevyBreeze

Answer/Explanation:

First, initiator protein unwinds a short stretch of the DNA double helix. The length of the DNA double helix about to be copied must be unwound.  In addition, the two strands must be separated, much like the two sides of a zipper, by breaking the weak hydrogen bonds that link the paired bases.   Once the DNA strands have been unwound, they must be held apart to expose the bases so that new nucleotide partners can hydrogen-bond to them. Then, a protein known as helicase attaches to and breaks apart the hydrogen bonds between the bases on the DNA strands, thereby pulling apart the two strands.

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