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

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

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

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

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

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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
All of these
concentrating enzymes within specific cellular compartments
grouping enzymes into free-floating, multienzyme complexes

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