what's the difference between a nucleotide and a nucleoside
Nucleoside Nucleosides are glycosylamines that can be thought of as nucleotides without a phosphate group. A nucleoside consists simply of a nucleobase (also termed a nitrogenous base) and a five-carbon sugar (either ribose or deoxyribose), whereas a nucleotide is composed of a nucleobase, a five-carbon sugar, and one or more phosphate groups. In a nucleoside, the base is bound to either ribose or deoxyribose via a beta-glycosidic linkage. Examples of nucleosides include cytidine, uridine, adenosine, guanosine, thymidine and inosine.
Nucleolus The nucleolus (/njuːˈkliːələs/ or /ˌnjuːkliˈoʊləs/, plural nucleoli /njuːˈkliːəˌlaɪ/ or /ˌnjuːkliˈoʊlaɪ/) is the largest structure in the nucleus of eukaryotic cells.[2] It is best known as the site of ribosome biogenesis. Nucleoli also participate in the formation of signal recognition particles and play a role in the cell's response to stress.[3] Nucleoli are made of proteins, DNA and RNA and form around specific chromosomal regions called nucleolar organizing regions. Malfunction of nucleoli can be the cause of several human conditions called "nucleolopathies"[4] and the nucleolus is being investigated as a target for cancer chemotherapy.[5][6]