enzymes. there are thousands of reactions that occur within organisms. these reactions would occur...
TRANSCRIPT
ENZYMES
There are thousands of reactions that occur within organisms.
These reactions would occur very slowly or not at all without enzymes.
Reactions can:
Build new molecules
Break down molecules
+
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Enzymes speed up theses chemical reactions.
Enzymes are catalysts.
How do enzymes speed up reactions?
Enzymes lower the activation energy
enzyme
substrate product
active site
Enzymes are not changed by the reaction.
Lock & Key: Specific substrate attaches to specific enzyme
How well an enzyme works depends on:
pH ( acids & bases)
Temperature
37°temperature
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Humanenzymes
Temperature and Activity of Enzyme
The activity of the enzyme decreases at temperatures above and below the optimum temperature.
7pH
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20 1 3 4 5 6 8 9 10
Stomachpepsin
Intestinetrypsin
11 12 13 14
Each enzyme works best at a specific pH.
Optimum pH = 3 Optimum pH = 8
pH and Activity of Enzyme
7pH
reac
tio
n r
ate
20 1 3 4 5 6 8 9 10
Stomachpepsin
Intestinetrypsin
11 12 13 14
The activity of the enzyme decreases at pH above and below the optimum temperature.
Acid Base
pH Scale
