BIOL130 Lecture Notes - Lecture 5: Stereoisomerism, Chemical Formula, Structural Isomer

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Macro(cid:373)olecules: protei(cid:374)s: macromolecules: large, organized molecules typically created by polymerization, biomolecules(biological macromolecules) = give structure and carry out activities of cell, 4 groups, proteins (amino acids) lipids, carbohydrates (polysaccharides, nucleic acids (nucleotides) Creating macromolecules: monosaccharide + monosaccharide (condensation) disaccharide + h2o, disaccharide + h2o ---- (hydrolysis) monosaccharide + monosaccharide, condensation: making the chain water comes out, hydrolysis: breaks chain consumes water in rxn. Go back to this later: amino acid structure, chirality, stereoisomers, zwitterions, amino acid classifications, peptide bonds, levels of protein structure, primary, secondary, tertiary, quaternary. R group = 20 different side chains gives amino acid diff properties. Amino group gains a proton (oxygen tends to pull electrons away, making it easy to lose proton: amino acids are ionized under physiological conditions. Polarity depends on r group: non-polar --> hydrophobic r groups, no charged/ electronegative atoms to form h bonds. Primary: linear(but not straight) amino acid sequence still twists and turns.

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