Enzymes
The proteolysis rate enhancement by chymotrypsin (~1010 folds) corresponds to a reduction in activation energy of about

88 kJ/mol
58 kJ/mol
49 kJ/mol
40 kJ/mol

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

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

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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
changing the three-dimensional shape of the molecule
the input of a small amount of activation energy
oxidizing the molecules by removing electrons

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Enzymes
The cleavage specificity of trypsin and chymotrypsin depend in part on the

proximity of Ser 195 to the active site or specificity pocket
absence of water in the active site
size, shape, and charge of the active site or specificity pocket
presence of a low-barrier hydrogen bond in the active site or specificity pocket

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