How are the chemical structures of DNA and RNA alike and different?
DNA has a double helix shape and has two strands of nucleotides, while RNA has only one. DNA has the nitrogen base thymine, while RNA has the base uracil. DNA has the sugar deoxyribose, while RNA has the sugar ribose. The similarities are that they both have the bases cytosine, adenine, and guanine. They also both contain sugar, phosphate groups, and nitrogen bases, and they are both nucleic acids.
