Video Transcript
What nitrogenous base in DNA is replaced by uracil in RNA?
Nucleic acids are large macromolecules that are essential to all forms of life. Nucleic acids are polymers that are composed of multiple repeating units called
nucleotides. They store and transmit genetic information and can include both DNA and RNA.
Here is the basic structure of a nucleotide. A nucleotide contains a phosphate group, a pentose sugar, and a nitrogenous base. The type of nitrogenous base differs between DNA and RNA. In DNA, there’s guanine, cytosine, adenine, and thymine, while in RNA, there’s
guanine, cytosine, adenine, and uracil. There is no thymine in RNA; instead, it’s replaced by uracil.
Therefore, the nitrogenous base in DNA that’s replaced by uracil in RNA is
thymine.
