Explain how the structure of mRNA differs from the structure of DNA

The structure of mRNA differs from the structure of DNA in that mRNA is a single-stranded molecule whereas DNA is a double-stranded molecule in the form of a helix. Another difference between them is that the sugar molecule present on mRNA is ribose but in DNA is deoxyribose, meaning that it lacks an oxygen atom on carbon atom number 2. In addition, in mRNA uracil replaces thymine present in DNA as one of its bases. Lastly, DNA contains base pairs linked via hydrogen bonds whereas mRNA lacks these.