There is carbon in the sugar (ribose, deoxiribose) and in the base-pairs.
Adenine occurs in both RNA and DNA molecules. It is uracil that replaces thymine in the RNA molecule.
A carbon based molecule is a polymer. Edit: A carbon based molecule does not have to be a polymer, although some polymers are carbon based. For example methane - CH4 is carbon based and not a polymer. Carbon based molecules are called organic compounds.
The key difference between a DNA nucleotide and an RNA nucleotide is their five-carbon sugar molecules. One component of RNA is the five-carbon sugar ribose, C5H10O5. Alternatively, in DNA, the five-carbon sugar deoxyribose (C5H10O4) has one fewer oxygen atom. Another difference is in the nitrogenous bases of some DNA and RNA nucleotides. The nitrogenous base uracil (U) is unique to RNA nucleotides. Similarly, the nitrogenous base thymine (T) is unique to DNA nucleotides.
Thymine is found in DNA but not in RNA. Uracil replaces thymine in RNA. In other words: DNA has thymine. RNA has uracil.
Thymine
DNA are replicator molecules. DNA molecules are able to male copies of themselves in a process called DNA replication. RNA molecules however, are synthesized using a DNA template through a process called transcription
DNA contains thymine, but RNA has uracil in its place.
In DNA, the sugar is deoxyribose. In RNA, it is ribose.
All living things have DNA or rna
Organisms are composed of organic, that is carbon containing molecules. Glucose (C6H12O6) and adenosine triphosphate (ATP), carbon dioxide (CO2), and DNA/RNA macromolecules are such organics.
In DNA the five-carbon sugar is deoxyribose. In RNA the five-carbon sugar is ribose.
In addition to DNA, messenger RNA, ribosomal RNA, and transfer RNA are needed to make proteins.