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Unformatted text preview: 2. RNA: ribose 3. Nucleotide Polymers 1. Adjacent nucleotides are joined by covalent bonds 1. Bonds called phosphodiester linkages 2. Join the OH group on the 3 carbon of one nucleotide and the phosphate on the 5 carbon of the next 3. Creates a sugar phosphate backbone 4. Direction from 5 to 3 2. The DNA Double Helix 1. Two suager-phosphate backbones run in opposite 5 3 directions 1. Antiparallel 2. Strands (polynucleotides) held together by hydrogen bonds between paired bases, van der Waals interactions between stacked bases 3. DNA and Proteins as Tape Measures of Evolution 1. DNA shows relationships between species BIO 202 Notes 1. Closely related species share a greater proportion of their DNA and protein sequences than more distantly related species...
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- Fall '08