Og

nucleoside triphosphate nucleoside triphosphate

nucleoside triphosphate

growing chain (n long)

growing Chain (n+1 long)

phosphate growing chain (n long)

growing Chain (n+1 long)

pyrophosphate

pyrophosphate

phosphate

phosphate growing chain (rt + 1 long)

figure 4-5 Two scenarios for nudeic acid biosynthesis, (a) Synthesis of nucleic acids using nucleoside diphosphates, (b} Synthesis of nucleic acids using nucleoside triphosphates.

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