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1. In an experiment, a scientist notices that an enzyme’s catalytic rate decreases when the pH of the environment is changed. Which of the following best summarizes the effect of pH on the enzyme?





A.
pH changes the shape of the enzyme.




B.
pH takes energy away from the enzyme, thus slowing it down.




C.
pH changes the atomic structure of the enzyme.




D. pH changes the ability of the enzyme to dissolve in water

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