A-level Biology Notes

Describe semi conservative replication?

-DNA double strand separate and act as templates, producing 2 identical copies of DNA, each half has the original strand and half the new strand 

-DNA helicase breaks hydrogen bonds between the complementray bases

-double strand seperates, leaves 2 template strands

-free complementary nucleotides bind to exposed bases on the template strands ( A to T, C to G)

-DNA polymerase joins the sugar phosphate backbone of the new strand