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Energy and Enzymes Section 2.4.

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Presentation on theme: "Energy and Enzymes Section 2.4."— Presentation transcript:

1 Energy and Enzymes Section 2.4

2 Chemical Reactions Reactions create energy transfer
Energy – the ability to do work or cause changes Chemical reaction: Reactants  Products Ex. H2O + CO2  H2CO3 Reactions create energy transfer Exergonic Reactions - __________ free energy

3 Chemical Reactions Reactions create energy transfer
Energy – the ability to do work or cause changes Chemical reaction: Reactants  Products Ex. H2O + CO2  H2CO3 Reactions create energy transfer Exergonic Reactions - ___release_ free energy Endergonic Reactions - _________ free energy

4 Chemical Reactions Reactions create energy transfer
Energy – the ability to do work or cause changes Chemical reaction: Reactants  Products Ex. H2O + CO2  H2CO3 Reactions create energy transfer Exergonic Reactions - ___release_ free energy Endergonic Reactions - __absorb_ free energy

5 Activation energy – energy needed to start a reaction.
Catalysts – chemical substances that reduce the amount of activation energy needed for a reaction. Ex. _______

6

7 Enzymes Enzymes speed up reactions by lowering the activation energy needed for a reaction Enzyme binds to substrate Enzymes are substrate-specific (1E = 1S) (like a lock and key)

8 Factors that affect Enzyme Activity
Temperature Concentration pH Regulatory molecules


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