Problem 4PE
Determine whether the following molecules are polar or nonpolar: (a) NF3, (b) BCl3.
CHEM4270 BiochemistryI Proteins:MainAgentsinBiologicalFunctions Catalysis - Enolase‐glycolyticpathway - DNApolymerase‐DNAreplication Transport - Hemoglobin‐O2transport - Lactosepermease‐transportslactoseacrosscellmembrane Structure - Collagen‐connectivetissue - Keratin‐hair,nails,feathers,horns Motion - Myosin‐muscletissue - Actin‐muscletissue,cellmotility AminoAcids:BuildingBlocksofProteins - 20aminoacids - Linearheteropolymersofα‐aminoacids - Aminoacidshavepropertiesthatarewell‐suitedtocarryoutavarietyofbiological functions Capacitytopolymerize Usefulacid‐baseproperties Variedphysicalproperties Variedchemicalfunctionality - Mostα‐aminoacidsarechiral All(exceptproline)have: - Acidiccarboxylicgroups - Basicaminogroup - α‐hydrogenconnectedtoα‐carbon Rgroupisuniquetoeachaminoacid(GlycinehasHydrogenasRgroup,α‐carbonis notchiral) - NamingAminoAcids Startatα‐carbon,continuenumberingdownchain - AllAminoAcidsarechiral(exceptGlycine) ProteinsonlycontainLisomersofaminoacids(AminogroupisontheLeft) - Classifications Nonpolar,aliphaticRgroups(7) - Rgroupisahydrocarbonchain - NoadditionchargesbesidesZwitterioncountercharges - Methionine‐hasthioether,unreactivebecausecarbonatomsneutralizecharge AromaticRgroups(3) - AbsorbUVlightat270‐280nm - Tryptophanhasindolering Pol