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7 April, 09:46

Explain why a purine base (Adenine & Guanine) must be paired with a pyrimidine base (Thymine &

Cytosine)

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  1. 7 April, 11:08
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    Because hydrogen bonds are not as strong as covalent bonds, base pairings can easily be separated, allowing for replication and transcription. Because purines always bind with pyrimidines - known as complementary pairing - the ratio of the two will always be constant within a DNA molecule.
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