Why does it matter that the RNA sequence of nucleotides is completely determined by the DNA sequence of nucleotides?

See the answer below

Explanation:

It is important that the RNA nucleotide sequence be completely determined by the DNA nucleotide sequence because the RNA is a stop-gap/intermediate molecule for the transfer of genetic information.

The RNA only acts as a messenger between the DNA and the protein of an organism. DNA cannot directly be translated to protein but requires an intermediate storage molecule which has to preserve the original information as genetic codes and later translate these codes into their respective proteins during the process of synthesizing proteins.