Enzymes
Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of

two proteins designated A and B
a protein A and one-subunit a
a protein designated A
a protein designated B

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

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

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

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

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