Enzymes
Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of

two proteins designated A and B
a protein designated B
a protein designated A
a protein A and one-subunit a

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Enzymes
Enzyme-driven metabolic pathways can be made more efficient by

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

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

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

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

the input of a small amount of activation energy
oxidizing the molecules by removing electrons
changing the three-dimensional shape of the molecule
changing the reaction from a biosynthetic to a catabolic pathway

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

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