(b) 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
40C. The results are shown in the figure below.
P
Q
R

(1) Explain why the investigation was carried out at 40°C. What do we call this
temperature?
(il) Using information in the diagram, describe the effects of increasing pH on the rate
of activity of enzyme Q.

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.