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 catalyzes the production of hormones that maintain the stomach lining
It is critical for the biosynthesis of DNA

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

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

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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 are proteins whose three-dimensional form is key to their function
Enzymes speed up reactions by lowering activation energy
All of these

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