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

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

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Enzymes
Which of the following is false statement with regard to comparison between Serine and HIV proteases?

Both show specificity for certain amino acid sequences
Both forms an acyl-enzyme intermediate
Both use nucleophilic attack to hydrolyze the peptide bond
Both require water to complete the catalytic cycle

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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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