DNA- a double helix of paired bases

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 DNA- a Double Helix of Paired Bases

1) A DNA molecule has two stands coiled together in the shape of a double helix (two spirals) 2) The two strands are held together by chemical called bases.

3) There are four different bases. (shown in the diagram as different colours)- adenine (A), cytosine (C), guanine (G) and thymine (T)

4) The bases are paired.

5) They always pair up in the same way- it is always A-T and C-G. This is called base-pairing.

6) The base pairs are joined together by weak hydrogen bonds.

7) a gene is a section of DNA.

8) The sequence of bases in a gene code for a specific protein.

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