The double helix. Computer graphic illustration of the structure of DNA. The two helices of the structure are formed by alternating phosphate and sugar groups in the 'backbones'. At each sugar is a nucleic acid base (adenine,thymine,cytosine or guanine),pointing inward. Each base in one helix is fixed to a base in the opposite (or complimentary) helix by hydrogen bonding. In DNA,adenine in one helix always bonds to thymine in the other,likewise cytosine always bonds to guanine. This equivalence (known as Chargaff's Rule) is the key to DNA replication | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Kulyk, Mehau |
Bildgröße: | 5093 px × 3837 px |
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Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |