Chemical Reactions and Enzymes. Are processes that change or transform, one set of chemicals into...
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Transcript of Chemical Reactions and Enzymes. Are processes that change or transform, one set of chemicals into...
![Page 1: Chemical Reactions and Enzymes. Are processes that change or transform, one set of chemicals into another. Drive all the activities associated with.](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649f175503460f94c2d30a/html5/thumbnails/1.jpg)
Chemical Reactions and
Enzymes
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Are processes that change or transform, one set of chemicals into another.
Drive all the activities associated with life.
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Involve reactants (starting materials) and products (ending materials). The atoms of the
reactants are rearranged to form the products.
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There are two types Endothermic
▪ Absorb energy▪ Breakdownmacromolecules
Exothermic▪ Release energy▪ Build macromolecules
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Need some energy to get started The needed energy is called
activation energy.▪ Activation energy is a chemical push
Is required for both exothermic and endothermic reactions.
Is lowered by enzymes▪ Enzymes are biological catalysts that
speed up chemical reactions, but are not used up by them.
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Enzymes speed up reactions by lowering the activation energy (Ea) of a reaction. The activation energy is the energy needed to start a reaction.
Different reactions have different activation energies.
reaction (time)
ener
gy
(kJ)
Ea with enzyme
Ea without enzyme
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Are large folded proteins that are made of hundreds of amino acids.
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All enzymes have active sites Active sites
▪ Form in the protein folds.
▪ Have a complimentary substrate shape.
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Speed up chemical reactions by binding with specificmolecules. The specific
molecule is a substrate.
Promote specific chemical reactions
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http://www.youtube.com/watch?v=V4OPO6JQLOE
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Are affected by heat, acidity, and enzyme concentration Enzymes function with in a certain
temperature range. Enzymes cease to function if the
strength of acids in body fluids is too high or too low.
Enzyme concentration determines if a reaction occurs.
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![Page 13: Chemical Reactions and Enzymes. Are processes that change or transform, one set of chemicals into another. Drive all the activities associated with.](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649f175503460f94c2d30a/html5/thumbnails/13.jpg)
Work with a partner to answer questions 1-3 of Assessment 2.4 on page 53 of your Biology textbook. Write the questions and answers in your notebook. Answer the questions thoughtfully and with complete sentences.
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