DNA is made of nucleotides, which are formed by 3 components:
1. A deoxyribose sugar
2. A phosphate group
3. An organic base,either Cytosine, Thymine, Guanine or Adenine
They are combined via a condensation reaction. The structure of DNA was founded by Watson and Crick in 1953. It is made of two strands of polynucleotides joined by hydrogen bonds.
Pairing of bases: Adenine pairs eith thymine by two hydrogen bonds, and Guanine pairs with cytosine by 3 hydrogen bonds. These pairings are therefore said to be complementary.
The double helix is a ladder like arrangement of two polynucleotides being twisted.
The function of a DNA molecule is to pass genetic information from cell to cell.It is adapted for this by the following ways:
1. Very stable and doesn't change from generation to generation
2. Bonds connected by hydrogen bonds so can easily undo and replicate
3. Very large molecul
4, Helical shape protects genetic information
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