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

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

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

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