chapter  2
Fundamentals of Gene Structure, Gene Expression, and Human Genome Organization
Pages 38

Our genome is complex, comprising about 3.2 Gb (3.2 × 109 base pairs; Gb = gigabase) of DNA. One of its main tasks is to produce a huge variety of different proteins that dictate how our cells work. Surprisingly, however, coding DNA-DNA sequences that specify the polypeptides of our proteins-account for just over 1.2% of our DNA.