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

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

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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 speed up reactions by lowering activation energy
Enzymes do not alter the overall change in free energy for a reaction

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

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