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

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

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

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

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Enzymes
How is the enzyme COX-1 important in human health?

It helps to transport carbon dioxide in the blood
It is a chemical derivative of aspirin
It catalyzes the production of hormones that maintain the stomach lining
It is critical for the biosynthesis of DNA

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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
fixing enzymes into membranes so that they are adjacent to each other
All of these

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