How can a mutation that retains an intron's sequence and a triplet repeat mutation have a similar effect on a genes encoded protien?

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In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Which of the following describes how binary fission and mitosis are similar? a)they are both used for growth or repair b)they both break down membrane-bound nuclei c)both invoke the replication of a single stand of dna d)both replicate genetic material