2.5 Enzymes - 2.5 Enzymes Essential Idea Enzymes control the metabolism of the cell Soniya Nahata IB Biology(SL Understandings U1 Enzymes have an active

2.5 Enzymes - 2.5 Enzymes Essential Idea Enzymes control...

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29/09/15’ 2.5:’Enzymes ’ Soniya’ Nahata’ IB’Biology’(SL) ’ 26 Essential Idea: Enzymes’control’the’metabolism’of’the’cell. Understandings: U1. Enzymes’have’an’active’site’to’which’specific’substrates’bind: Enzymes: o Globular’proteins ’ o Work’as’catalysts ’ § Speed’up’the’rate’of’the’reaction o Substances’that’enzymes’convert’into’ products are’ substrates .’ o Substrate’ à enzyme à product’ o One’enzyme’catalyses’one’biochemical’reaction. o Enzyme-substrate specificity: § Catalyses’the’t housands’of’reactions ’ that’ take’place’ in’cells. ’ § Involves’the’substrate’binding’to’the’active’site. Ø While’bound’to ’ the’active’site’the’substrate’is’ converted’into’a’product’and’is’released,’ freeing’the’active’site’to’catalyse’another’ reaction.’ U2. Enzyme’catalysis’involves’molecular’motion’and’the’collision’of’ substrates’with’the’active’site: Three’stages’of’enzyme’activi ty:’ o Substrate’binds’to’the’active’site.’Some’enzymes’have’two’ substrates’that’bind’to’different’parts’of’the’active’site. o

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