The structure of nucleic acids, DNA and RNA, differ in that

DNA contains a nucleotide with thymine, while RNA contains a nucleotide with uracil.
RNA's backbone is made up of phosphates, while DNA's backbone is made up of nitrates.
RNA contains only three different nucleotides, while DNA contains four different nucleotides.
DNA's nucleotide sequence is single stranded, while RNA's nucleotide sequence is double stranded.

RNA's backbone is made up of phosphates, while DNA's backbone is made up of deoxyribose sugars.

RNA contains only three different nucleotides (adenine, cytosine, and uracil), while DNA contains four different nucleotides (adenine, cytosine, guanine, and thymine).
RNA's nucleotide sequence is typically single stranded, while DNA's nucleotide sequence is typically double stranded in the form of a double helix.