5: Three enzymes, P, Q and R, were extracted from different regions of the alimentary
canal of a mammal. The effect of pH on the activity of the enzymes was investigated at
40°C. The results are shown in Fig. 3.2.
R
100 -
rate of
enzyme
activity /
arbitrary
M
25
0
1 1
1
pH
Fig. 3.2
() Explain why the investigation was carried out at 40°C.​