Enzymes
Common feature in all serine proteases is a

hydrophobic specificity pocket
cluster of reactive serine residues
single reactive serine residue
hydrophilic specificity pocket

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

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

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
oxidizing the molecules by removing electrons

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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 catalyzes the production of hormones that maintain the stomach lining
It is critical for the biosynthesis of DNA
It is a chemical derivative of aspirin

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