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biology unit 1 higher
1.1-cells and movement across membranes
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The model than an enzyme acts upon is called its
substrate
Enzyme reactions can be summarised by the equation:
substrate
+
enzyme --
-
> produc
ts
enzyme molecules are folded into a
special shape
Letter:
A
Letter:
C
Letter:
D
Letter:
A
Compared to the start of the reaction, the enzyme molecule at the end is
exactly the same
the part of the enzyme molecule where the substrate fits in is called the
active site
this picture of how enzymes work is sometimes called the
enzyme substrate complex
for it's function, the shape of an enzyme molecule is
essential
if an
enzyme
molecule is
heated
too much, it denatures-its shape is
changed or destroyed
How enzymes behave at different temperatures is best summarised by: different enzymes work best at
different temperatures
if an enzyme molecule is heated too high a temperature, it
permanently stops
working
how an enzyme behaves at different level of acidity is best summarised by: each enzyme has a
PH
that it
catalyses fastest
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