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

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

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

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

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