Enzymes
Which of the common features are shared between serine and aspartate proteases?

Both show specificity for certain amino acid sequences
Both use a base to activate the nucleophile
Both require water to complete the catalytic cycle
All of these

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

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

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Enzymes
Before they can react, many molecules need to be destabilized. This state is typically achieved through

the input of a small amount of activation energy
changing the reaction from a biosynthetic to a catabolic pathway
oxidizing the molecules by removing electrons
changing the three-dimensional shape of the molecule

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