The best classification system is that which most closely a. unites organisms that possess similar morphologies. b. conforms to traditional, linnaean taxonomic practices. c. reflects evolutionary history. d. corroborates the classification scheme in use at the time of charles darwin. e. reflects the basic separation of prokaryotes from eukaryotes.

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.