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DNA is a polymer of dNMPs (dAMP, dTMP, dCMP, and dGMP). That's why you could describe DNA by dNMPn (n base length). When another dNTP is added to DNA (dNMPn), one pyrophosphate (PPi) is released. It is obvious that the length of the DNA results in n+1 bases.


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The notation you are referring to is a way to express the elongation of a nucleotide strand (Fig. 1). dNTP + dNMP(n) → dNMP(n+1) + PPi means Existing strand + deoxynucleotidetriphosphate → elongated-strand + pyrophospate. Fig. 1. Elongation of DNA. Source: Concepts in Genetics. This reaction holds for DNA replication as well as ...



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