7 A student who was training for a cross country race jogged for 2.0 hours and covered a distance of 14.0 kilometers. What was the average speed of the student?
A
28.0 km/hr
B
7.0 km/hr
С
12.0 km/hr
D
0.14 km/hr

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.