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

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

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

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
size, shape, and charge of the active site or specificity pocket

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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
All of these
Enzymes are proteins whose three-dimensional form is key to their function

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Enzymes
Before they can react, many molecules need to be destabilized. This state is typically achieved through

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

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