41. Match the enzyme classes with the reactions they catalyze (IUPAC’s Enzyme Cl

Question

41. Match the enzyme classes with the reactions they catalyze (IUPAC’s Enzyme Classification). Hint: No need to memorize this. The class name indicates what type of reaction the enzymes catalyze.

a) E.C. 1 Oxidorreductases

b) E.C. 2 Transferases

c) E.C. 3 Hydrolases

d) E.C. 4 Lyases

e) E.C. 5 Isomerases

f) E.C. 6 Ligases

_____ Transfer of organic functional groups
_____ Rearrangement of atoms within a molecule
_____ Joining of two molecules usually with expenditure of ATP _____ Redox reactions; involves electron transfer
_____ Removal of functional groups or atoms without hydrolysis _____ Hydrolysis (molecule breakdown by addition of water)

24. In a plot of 1/v0 vs. 1/[S], the Y-intercept (i.e. the value of Y when X = 0) is found to be the same for both SA and SB. This indicates that the enzyme has the same ______ for both substrates.

a) Vmax

b) Km

c) KmandVmax

d) DG°'

e) None of the above

10. Regarding Km values, which of the following is a correct conclusion from these data?

a) theKmforbothS1andS2is100

b) theKm forbothS1 andS2 is50

c) theKmforbothS1andS2is5.0

d) the Km for S1 is 0.0002 and for S2 is 0.0005

e) theKm forS1 is50andforS2 is29

Explanation / Answer

41. Transferases transfer of organic functional group.

Isomerases rearrangement of atoms within a molecule.

Ligases joining of two molecules usually with expenditure of ATP oxidoreductases Redox reactions; involves electron transfer

Lyases removal of functional groups or atoms without hydrolysis hydrolases hydrolysis.

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