3.11 describe a DNA molecule as two strands coiled to form a double helix, the strands being linked by a series of paired bases: adenine (A) with thymine (T), and cytosine (C) with guanine (G)

 3.11 •DNA is a double helix

                  •the two strands are held together by chemicals called bases 

                  •there are four different bases - adenine (A), cytosine (C), guanine (G) and thymine (T)

                  •the bases are paired, either in A-T or C-G - equally 

                            •DNA is a type of nucleic acid 

                            •the DNA can reproduce itself, so is effective as the genetic material