A dilute starch solution turns blue when very dilute iodine solution is added. This colour disappears as the starch is broken down by amylase.
The graph shows the disappearance of the blue colour at different temperatures.
Which statement explains the shape of the curve?
1 )
Enzyme activity rises as the temperature rises.
Enzymes have an optimum temperature range for activity.
3 )
Enzymes are inactive below 30$^\circ$C.
4 )
Enzymes do not work above 30$^\circ$C.
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