Key Terms

Terms in bold are defined amino acids 75 R group 76 chiral center 76 enantiomers 76 absolute configuration 77 d, l system 77 polarity 78 zwitterion 81 absorbance, A 82 isoelectric pH (isoelec-

tric point, pI) 84 peptide 85

in the glossary. protein 85 peptide bond 85 oligopeptide 85 polypeptide 85 oligomeric protein 87 protomer 87 conjugated protein 88 prosthetic group 88 primary structure 88 secondary structure 88 tertiary structure 88

quaternary structure 88

crude extract 89 fractionation 89 dialysis 89 column chromatography 89 high-performance liquid chromatography (HPLC) 90 electrophoresis 92 sodium dodecyl sulfate (SDS) 92

isoelectric focusing 93

Edman degradation 98 proteases 99 proteome 101 lateral gene transfer 107 homologous proteins 107 homolog 107 paralog 107 ortholog 107 signature sequence 109

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