-DNA double helix
-join nucleotide by condensation reaction between sugar and phosphate to form a polynucleotide
-joins 2 polynucleotides by hydrogen bonds between the bases.
-A joins with T, C joins with G (complementary base pairing)
-produces double strand
-then coil double strand into double helix
![](https://img.wattpad.com/cover/272714285-288-k56915.jpg)
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A-level Biology Notes
General FictionTopics 1-4 of A-level Biology AQA New specification