The graph shows the effect of temperature on an enzyme-controlled reaction.
Which statement describes the effect of temperature on this reaction?
As the temperature increases to ${25^ \circ }C$ the reaction speeds up.
2 )
Between ${10^ \circ }C$ and 20 °C the enzyme stops working.
3 )
Between ${35^ \circ }C$ and ${45^ \circ }C$ the enzyme stops working.
4 )
The optimum temperature for this reaction is ${40^ \circ }C$.
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