XNA is a nucleic acid produced in the laboratory. It is constructed from nucleotides in which one part has been substituted with chemical X. Chemical X is organic, but it does not occur naturally. The section of the molecule that carries the code is unchanged. Which part of a DNA or RNA nucleotide has been replaced by the organic chemical X?
- Afive-carbon sugar
- Bphosphate group
- Cpurine base
- Dpyrimidine base