Enzymes How are enzymes important to life process? I. Enzymes A. are large _______________ B. __________ _______ chemical reactions C. are ____________________ - a substance that ___________ _____ the rate of a reaction without being _____ ___ or _______________ by the reaction. D. _________________ the amount of activation energy needed for a reaction to get started. E. Ex. A reaction that normally takes 50ºC to occur, will take place at _________ if we add an enzyme or catalyst. II. Enzymes Lower Activation Energy which Speeds Up the Reaction A. Activation energy- is the _______________ amount of energy needed to get a reaction ______________. B. Enzymes ____________ the amount of ___________ needed; therefore ____________ ____ the reaction. III. How do Enzymes Work? A. Use a _________-and-____________ model B. Enzymes have an _________ __________ which has a specific __________ that combines with a ____________. C. The _______________ fits into the _____________ _______ (like a pocket) on the enzyme just as a _____________________________. D. When the reaction finishes, the enzyme and new products separate, and the enzyme is free to _________________. IV. Lock-and-Key Model V. Naming Enzymes A. Enzyme names end in “-________”. B. Names are based on the _______________ that the enzyme acts on. C. Example: The sugar _________ is the substrate that acts on the enzyme _____________. The sucrase enzyme breaks up sucrose into ___________ and _____________. VI. Denaturing of Enzymes A. Enzyme action is affected by: ___________________ and _________ (acids/bases). B. When temperature or pH is not ___________ the enzyme changes ____________ and becomes ____________- or does not work properly. C. Higher ___________ or strong _______________ change the ____________ of the enzyme making it ________________. VII. Digestion A. Many enzymes that aid in _______________ help your cells receive the ___________ it needs from the _________ you eat. B. __________________ is all the ______________ reactions that take place in your ________. Enzymes help to carry out these reactions.