Dna replication: a. occurs by the addition of nucleotides to the end of the dna molecule. b. results in the formation of four new dna strands. c. produces two daughter dna molecules that are complementary to each other. d. uses each strand of a dna molecule as a template for the creation of a new strand. e. begins when two dna molecules join together to exchange segments.

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.