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

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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
Catalyze the reduction of pyruvic acid to acetyl Co A and CO2
decatalyze 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
Enzyme-driven metabolic pathways can be made more efficient by

fixing enzymes into membranes so that they are adjacent to each other
concentrating enzymes within specific cellular compartments
grouping enzymes into free-floating, multienzyme complexes
All of these

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