Fill in the blank below: in a digestive system, digestion takes place outside of the cells in a series of tubes. food enters one opening and food remnants exit out of a different opening. examples of organisms with this type of digestive system include you, dogs, horses, spiders and earthworms.

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.