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

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

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Enzymes
Enzyme-driven metabolic pathways can be made more efficient by

All of these
grouping enzymes into free-floating, multienzyme complexes
concentrating enzymes within specific cellular compartments
fixing enzymes into membranes so that they are adjacent to each other

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

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