Enzymes
Which of the following statements about enzymes or their function is true?

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

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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
All of these
grouping enzymes into free-floating, multienzyme complexes

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

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
It is critical for the biosynthesis of DNA

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

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