WJEC GCSE Biology 2 Enzymes

enzymes revision notes

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  • Created on: 22-05-12 16:54
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Biology Revision Notes:
An enzyme is a biological catalyst which speeds up a reaction without being changed or used up in
the reaction. Examples can be found in our bodies in the digestive system, or in biological washing
This diagram could show an amylase enzyme (blue
shape) breaking up a starch (A) to give glucose
molecules (E). These enzymes are specific and can
only speed up reactions for the right substrates.
This graph shows the optimum
temperature for this enzyme is about 37oC
(probably an enzyme in a human body).
At any point before the optimum
temperature, the enzymes are working,
but slowly.
As the heat is increased, the particles
move faster, and therefore enzymes are
more likely to collide with substrates and
After the optimum temperature, the
enzymes are denatured and destroyed. This is an irreversible reaction.
This graph is different, as either side if
the optimum temperature the enzymes are
denatured. The optimum temperature is
shown here above the blue line.
Whereas many enzymes have similar
optimum temperatures, their optimum pH
values can be completely different.


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