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

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

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

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

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Enzymes
The cleavage specificity of trypsin and chymotrypsin depend in part on the

presence of a low-barrier hydrogen bond in the active site or specificity pocket
proximity of Ser 195 to the active site or specificity pocket
size, shape, and charge of the active site or specificity pocket
absence of water in the active site

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

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