A DNA parental strand composed of two complementary strands unwind., The weak-temporary hydrogen bonds between the bases break. Two new template strands form exposing bases., Primers attach to the 3’ end and free nucleotides bind with their base pair by new weak-temporary hydrogen bonds., The nucleotides are added by the enzyme DNA polymerase, which forms the sugar-phosphate bonds making the sugar-phosphate backbone., Two new identical strands are formed and DNA rewinds., When the DNA is unzipping, a “fork” is formed. DNA polymerase can only add the DNA nucleotides in one direction – from 3’ to 5’ on the original strand.,

Higher 1.2 DNA Replication Stages

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