文档介绍：Biology102Lecture5:BiologicalMolecules(cont.)LectureoutlineProteinsFunctionsStructureNucleicacidsFunctionsStructureProteinsKeyfunctions:StructureSkin(collagen);hairandnails(keratin)MovementProteinsinmuscle(actinandmyosin)DefenseAntibodiesSignalsSeveralhormones(growthhormone,insulin)positionAminogroupCarboxylicacidgroup“R”-group:variablePropertiesofparticularaminoacidsarebasedontheirR-groupsThereare20totalaminoacidsHereareafewexamplesProteinsynthesisProteinsareformedwhenaminoacidslinktogetherwithadehydrationsynthesisreactionNotewheretheylinktogetherNotetheformationofwater:©2002PearsonEducation,Inc.,