6.2 Enzymes and Chemical Reactions pages 156-160. Chemical reactions take place all the time. Chemical reactions change substances into different ones by breaking and forming chemical bonds . Reactants are the starting materials.
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6.2 Enzymes and Chemical Reactionspages 156-160
6CO2 +6H2O+light energyC6H12O6 + 6O2
A catalyst lowers activation energy
Enzymes are catalysts in
Most reactions would occur too slowly without the help of enzymes, which speed up chemical reactions.
Characteristics of Enzymes
Substrates bind to anenzyme at certain places called active sites.
The enzyme bringssubstrates together and weakens their bonds.
The catalyzed reaction formsa product that is releasedfrom the enzyme.
The lock-and-key model helps illustrate how enzymes function.
‘Lock and Key Model’ – says there is a perfect fit between active site and substrate
An Enzyme at Work
- a change in pH can change the shape of the enzyme so that substrates can’t fit into active site.
1. What is this graph showing?
temperature and enzyme activity
2. What is the independent variable?
3. What is the optimum temperature for the enzyme?
4. At what temperature is the enzyme completely denatured?