Enzymes
Which of the following is false statement with regard to comparison between Serine and HIV proteases?

Both forms an acyl-enzyme intermediate
Both show specificity for certain amino acid sequences
Both use nucleophilic attack to hydrolyze the peptide bond
Both require water to complete the catalytic cycle

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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 reaction from a biosynthetic to a catabolic pathway
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 speed up reactions by lowering activation energy
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
All of these

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

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
It is a chemical derivative of aspirin

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