RNA Structure
RNA is a single strand of nucleotides.
The RNA nucleotide is made of sugars, phosphates, and nitrogenous bases.
The sugar is ribose
3. The nitrogenous bases are
a. adenine and guanine (both purines)
b. uracil and cytosine (both pyrimidines)
Differences from DNA:
(a) RNA contains the sugar ribose, while DNA contains the sugar deoxyribose (a type of ribose that lacks one oxygen atom), and
(b) RNA has the nucleobase uracil while DNA contains thymine.
(c) Unlike DNA, most RNA molecules are single-stranded and can adopt very complex three-dimensional structures.
Research Frontier
http://www.nature.com/news/a-cellular-puzzle-the-weird-and-wonderful-architecture-of-rna-1.18014?WT.mc_id=TWT_NatureNews