The chemical structure of DNA
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I can describe the chemical structure of DNA.
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DNA is a type of biological molecule called a nucleic acid.
DNA is made of two strands, each a long polymer of nucleotides, wound together in a double helix shape.
DNA is a polymer of four different nucleotides (A, C, G and T).
Each of the four types of nucleotide in DNA is made of the same sugar and a phosphate group, bonded to a different base.
Nucleotides in each strand of DNA pair up in a complementary way; A pairs with T, and C pairs with G.
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