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In RNA polymerase-directed transcription, during elongation, aspartyl residues (asp)along with Mg2+ ions coordinate the phosphates of the ribonucleotides. The overall reaction is (NMP)n +NTP → (NMP)n+1 +PPi. Which of the following is correct about the first and second Mg2+ ions?

In RNA polymerase-directed transcription, during elongation, aspartyl residues (asp)along with Mg²⁺ ions coordinate the phosphates of the ribonucleotides. The overall reaction is (NMP)n +NTP → (NMP)n+1 +PPi. Which of the following is correct about the first and second Mg²⁺ ions?