Fredrick is doing a lab on pH. He uses many household items to determine the pH of his items. Which of his actions best describes inappropriate lab safety?
He changes into closed-toed shoes before lab starts.
He doesn't wear goggles because he is using household chemicals.
He asks his teacher if he can mix high- and low. pH solutions before discarding them.
He leaves his workstation to identify all of the safety equipment in the lab.

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.