Enzymes
In the enzyme-catalyzed reaction shown below, what will be the effect on substances A, B, C, and D of inactivating the enzyme labeled E2? A ---(E1)---> B ---(E2)---> C ---(E3)--->

A, B, and C will still be produced, but not D
A, B, C, and D will all still be produced
A will still be produced, but not B, C, or D
A and B will still be produced, but not C or D

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

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

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

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

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
All of these

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