James Watson and Francis Crick with their model of DNA

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James Watson and Francis Crick with their model
of DNA
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phosphate group
guanine (G) base with a double-ring structure
adenine (A) base with a double-ring structure
sugar (ribose)
thymine (T) base with a single-ring structure
cytosine (C) base with a single-ring structure
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Base-pairing in DNA
or
or
one base pair
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2 nm diameter overall
0.34 nm between each pair of bases
3.4 nm length of each full twist of helix
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DNA Replication
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