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

decatalyze the oxidation of pyruvic acid to acetyl Co A and CO2
Catalyze the reduction of pyruvic acid to acetyl Co A and CO2
Catalyze the oxidation 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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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 will still be produced, but not B, C, or D
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

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

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

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

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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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