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2.1 DNA and RNA, 2.3 water and inorganic ions, 2.2 DNA replication, 2.4…
2.1 DNA and RNA
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complimentary base pairs - base pairs are bonded by hydrogen bonds, holding the polynucleotide strands together
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joining nucleotides
joined by condensation reaction between the phosphate group and carbon 3 on the pentose sugar phosphodiester bond
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2.2 DNA replication
conservative
conservative- parental DNA turns into tow separate strands of DNA so you get different daughter cells
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- DNA helicase unwinds the DNA strands and breaks the hydrogen bonds between the complimentary base pairs
- free activated nucleotides bind to the complimentary base pairs on the 2 template DNA polynucleotides
- DNA polymerase catalyses phosphodiester bonds between the phosphate group and the sugar to re-join the sugar phosphate backbone
- 2 identical DNA strands are formed. As each new strand contains 1/2 of the original strand DNA replication is to be semi conservative
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