The base pairing between a DNA strand and RNA nucleotide determines base added to an RNA strand
During Transcription an RNA copy is made from a gene sequence which called an mRNA molecule. and it leaves the nucleus into the cytoplasm of the cell.
The Base to be added to an RNA strand is basically determined by the base pairing between a DNA strand and RNA nucleotide.
Hence we can conclude that what determines the base added to an RNA strand is The base pairing between a DNA strand and RNA nucleotide.
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