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

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

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

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

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

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Enzymes
The E.coli pyruvic acid dehydrogenase complex is reported to

Catalyze the oxidation of pyruvic acid to acetyl Co A and CO2
decatalyze the oxidation of pyruvic acid to acetyl Co A and CO2
Catalyze the reduction of pyruvic acid to acetyl Co A and CO2
retard the reduction of pyruvic acid to acetyl Co A and CO2

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