Enzymes
Enzyme-driven metabolic pathways can be made more efficient by

grouping enzymes into free-floating, multienzyme complexes
fixing enzymes into membranes so that they are adjacent to each other
concentrating enzymes within specific cellular compartments
All of these

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Enzymes
Which of the following statements about enzymes or their function is true?

Enzymes do not alter the overall change in free energy for a reaction
Enzymes are proteins whose three-dimensional form is key to their function
Enzymes speed up reactions by lowering activation energy
All of these

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