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

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

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

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

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

It is a chemical derivative of aspirin
It catalyzes the production of hormones that maintain the stomach lining
It helps to transport carbon dioxide in the blood
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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Enzymes
Before they can react, many molecules need to be destabilized. This state is typically achieved through

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

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