Biochemistry 2280A Chapter Notes - Chapter All: Dna Mismatch Repair, Regulatory Sequence, Dna Replication
Document Summary
Topic 18 intro to dna and rna. Dna and rna are built form subunits called nucleotides. Nucleosides: a nitrogen-containing ring compound linked to a 5 carbon sugar (either ribose or deoxyribose) Nucleotides: nucleosides that contain one or more phosphate groups attached to the sugar, ribonucleotides or deoxyribonucleotids. Nitrogen-containing rings are bases: under acidic conditions they can bind an h+ and increase the concentration of oh- ions in aqueous solution, cytosine (c), thymine (t), and uracil (u) Pyrimidines one ring: guanine (g) and adenine (a) Atp (adenosine triphosphate: ribonucleotide, participates in the transfer of energy, 3 phosphates linked in series by two phosphoanhydride bonds. Rupture of these bonds releases large amount of useful energy: terminal phosphate group frequently split off by hydrolysis, transfer of this phosphate to other molecules releases energy that drives energy-requiring biosynthetic reactions. Rna: a more temporary carrier of molecular instructions, has sugar ribose ribonucleic acid, bases a, g, c, and u, usually single stranded.