Why are ribonucleoside triphosphates the monomers required for rna synthesis rather than ribonucleoside monophosphates?

The phosphates provide energy for the bond between each nucleotide.

Explanation:

When each nucleotide is being bound, the two extra phosphates provide the energy needed for it to form the bind between each nucleotide that's being added to the RNA. Without this energy, the RNA wouldn't be able to form due to the lack of enough energy.

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