BIOCHEMISTRY

THE NUCLEIC ACIDS

DNA IS MADE OF TWO STRANDS OF POLYNUCLEOTIDE

• The sister strands of the DNA molecule run in opposite directions (antiparallel).

• They are joined by the bases.

• Each base is paired with a specific partner

• A is always paired with T

• C is always paired with G

• This the sister strands are complementary but not identical

• The bases are joined by hydrogen bonds, individually weak but collectively strong.

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© Paul Billiet 2012