BIO 1140 Lecture Notes - Dna Replication, Rna Editing, Hydrogen Bond
Document Summary
Unit 1: dna and rna- structure and function. The basic building blocks for dna and rna. Nucleoside = base and pentose sugar (e. g. : adenosine, cytidine, guanosine, thymidine / uridine) If the sugar is a deoxyribose = deoxyribonucleoside. In rna, uracil replaces thymine (uracil has no me group) Ribose replaces deoxyribose (ribose has a -oh group on the 2") Baceterium has circular dsdna (double stranded) organized into a protein/dna complex called the nucleoid. Eukaryotes have linear dsdna organized into protein/dna-containing chromosome. Mitochondrian and chloroplast have circular dsdna that are found in protein/dna complexes called nucleoid. Viruses can come as circular/linear, ss/ds, dna/rna in protein/dna complexes called capsids or viral particles/phage particles which bind dna/rna into dna/rna-protein complexes. This does not apply to prions (a protein that is infectious but is encoded by a genome; acts as an aberrant variant of a protein)