The second step of Experiment 5's multistep synthesis is an electrophilic aromatic substitution (EAS) reaction, similar to the reactions of our Klein text. What two key mechanistic steps are always involved in EAS reactions?
A. Loss of a leaving group and proton transfer.
B. Nucleophilic attack and loss of a leaving group.
C. Nucleophilic attack and carbocation rearrangement.
D. Nucleophilic attack and proton transfer.
E. Loss of a leaving group and carbocation rearrangement.

Which of the following characteristics are true of enzymes? check all that apply. a.)the structure of an enzyme can change if conditions change. b.)a single enzyme can normally catalyze a wide variety of reactions under many conditions. c.)enzymes are found only in nonliving systems. d.)enzymes allow living things to regulate body conditions through feedback mechanisms. e.)enzymes bind to specific substrates in specific ways. f.)enzymes increase the rate of reaction. g.)when shown in energy-reaction diagrams, enzymes represent the higher activation energy.