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Structure of DNA

Illustration of the double helical structure of the DNA molecule. The structure of DNA is illustrated by a right handed double helix, with about 10 nucleotide pairs per helical turn. Each spiral strand, composed of a sugar phosphate backbone and attached bases, is connected to a complementary strand by hydrogen bonding (non- covalent) between paired bases, adenine (A) with thymine (T) and guanine (G) with cytosine (C). Adenine and thymine are connected by two hydrogen bonds (non-covalent) while guanine and cytosine are connected by three. This structure was first described by James Watson and Francis Crick in 1953.

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Resource Type: Diagram, Image
Audience Level: High school lower division 9-10, High school upper division 11-12, Undergraduate lower division 13-14

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Authors and Editors: Access Excellence, Access Excellence @ the National Health Museum
Publisher: Access Excellence @ the National Health Museum
Format: text/html
Copyright and other restrictions: Yes
Cost: No

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