18) A) Allosteric enzymes can be identified because the plot of velocity versus

Question

18)

A) Allosteric enzymes can be identified because the plot of velocity versus substrate concentrtion is not hyperbolic, but is __________.?

B) What model of enzyme catalysis describes the formation of ES complex and displays a hyperbolic curve?

Question 20. (4pts) You are given the formula Vo Vmax ([S]/([S] + Km) When substrate concentration is much greater than Km, the rate of catalysis is almost equal to When substrate concentration is much less than the Km, the rate of catalysis is dependent upon

Explanation / Answer

17. V0=Vmax[S]/km+[S]

If S is much greater than Km than Km+[S]=[S]

therefore V0=Vmax[S]/[S]

or, V0=Vmax

Hence the rate of catalysis is maximal, independent of substrate concentration.

When the Substarte concentration is very low, then rate of catalysis directtly proportional to the Substrate concentration

18. Sigmoidal

Sigmoidal curves are characteristic of positive cooperativity, which means that the binding of the ligand at one site increases the enzyme’s a‰nity for another ligand at a di¤erent site. this is why they are called allosteric

B. Michaelis- menten model explains the formation of curve and displays a hyperbolic curve. and directly shows dependence of Vo on [S] in enzyme catalyzed reactions

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