Answer:
RNA is usually single stranded and contains uracil
Explanation:
DNA is the one which is double stranded (has a helical structure) and it has the nucleotide bases; Adenine, Thymine, Cytosine and Guanine whilst RNA is single stranded and does not form a double helix like DNA. RNA also has the same nucleotide bases but instead of having Thymine it has Uracil.