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In a nucleus, the number of ribonucleoside triphosphates is 10 times the number of deoxy $x 10$ ribonucleoside triphosphates, but only deoxyribonulceotides are added during the DNA replication. Suggest a mechanism.
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DNA polymerase enzyme is highly specific. It can recognise only deoxyribonucleoside triphosphates. Therefore, it cannot recognise RNA $\beta$-nucleotides.
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