Which of the following characteristics are true of enzymes? Check all that apply.

Enzymes are proteins, so changes in conditions such as temperature or pH can alter their structure. Their specific shapes allow them to bind particular substrates, and they increase reaction rates by lowering activation energy—not by representing a higher activation energy. Enzyme activity can also be regulated through feedback mechanisms, helping living things control body processes. Enzymes do not normally catalyze a wide variety of unrelated reactions, and they are found in living systems.

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