BIO206H5 Lecture Notes - Lecture 2: Nucleoside Triphosphate, Uridine, Cytidine
Document Summary
Nucleoside triphosphate structure: atp o: called nucleoside when a nitrogenous base is attached to a sugar. Two polynucleotide chains in the dna double helix are held together by hydrogen bonds between the bases on different strands. All the bases are on the inside of the double helix and the sugar phosphate backbone is on the outside. B-dna- primarily here when dna is examined (most common) Handedness is by convention (when you look down from the top, right handed goes up anticlockwise) Z dna may occur - may have specific functions, or occur temporarily, but no specific evidence yet. Both the coiling of the two strands around each other along with the fact that there is asymmetrical sugar attachment is what creates the two grooves. Rna structure and function: like dna: it has a sugar-phosphate backbone where nucleotides are joined by phosphodiester bonds that link monomer units together, unlike dna:
