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.
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.