Interestingly, this base substitution is not the only difference between DNA and RNA. A second major difference between the two substances is that RNA is made in a single-stranded, nonhelical form.

The more researchers examine RNA, the more surprises they continue to uncover. What have we learned about RNA structure and function ... that an RNA molecule and a DNA molecule could form a ...

When a gene is to be expressed, the base sequence of DNA is copied or transcribed into mRNA (messenger RNA ... bonds form between the adjacent amino acids to finalise the structure.