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if you see N on the mcat, think protein ---- Nucleotides: 3 components -5-C / pentose sugar -Nitrogenous base -phosphate group bases in nucleotides – AGCT and U polymers: DNA, RNA, Nucl-acids joined by phosphodiester nucleotides written 5’ to 3’ DNA written so top strand is 5’Æ3’ bottom is 3’Æ5’ RNA is 1-stranded