Sobre duas substâncias A e B sabe-se que: quando se adiciona fenolftaleina a substância A, a solução A torna-se avermelhada. Em presença de metilorange, a solução B é avermelhada. Pode se dizer com base nessas informações, que as substâncias A e B, podem ser: ácido e base
ácido e ácido
base e sal
ácido e sal
base e ácido

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.