Mutations in DNA molecules can occur when(1 point)
1 a change occurs in DNA nucleotide bases
2 replication of DNA is exact
3 a DNA enzyme attaches to an RNA codon
4 RNA codons are replaced by DNA nucleotides
1 a change occurs in DNA nucleotide bases
2 replication of DNA is exact
3 a DNA enzyme attaches to an RNA codon
4 RNA codons are replaced by DNA nucleotides