drydecay-
Why do certain bases pair up with eachother
Number of hydrogen bond attraction points (two in T + A, three in G + C) and size of base
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Antiparallel strands
Two strands are arranged so they run in opposite directions
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DNA functions
Replication of DNA and protein synthesis
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DNA replication
Copying DNA in the nucleus, done by semi-conservative replication. This means double helix separates into two strands and each strand makes a new double helix
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DNA helicase
Unzips two strands before replication and breaks H bonds
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DNA polymerase
Phosphodiester bonds between free nucleotides and template strands
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Semi-conservative replication
1. Two new molecules of DNA produced from one molecule. Each new molecule consists of one old strand (template strand) of DNA and one new strand. 2. DNA helicase unwinds and separates the two DNA strands. 3. DNA polymerase catalyses the formation of phosphodiester bonds between the free nucleotides and the template strand
