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

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

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Enzymes
In the enzyme-catalyzed reaction shown below, what will be the effect on substances A, B, C, and D of inactivating the enzyme labeled E2? A ---(E1)---> B ---(E2)---> C ---(E3)--->

A, B, and C will still be produced, but not D
A and B will still be produced, but not C or D
A will still be produced, but not B, C, or D
A, B, C, and D will all still be produced

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

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

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