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Enzyme 1 has km=5, specific activity = 103 u/mg

Enzyme 2 has km=130, specific activity = 811 u/mg

Let us simulate conditions in the stomach where there is excess of substrate such that all enzymes are continually saturated, and the products are constantly taken away.

Which is more effecient? For a given period of time, which one would end up with more products?

I am expecting enzyme 2 would have more products because of the higher specific activity. Am I right in assuming this? I have no idea how the km value would affect the efficiencies of the enzymes.

'grateful for any help here.

2007-03-07 20:00:16 · 1 answers · asked by justine d 2 in Science & Mathematics Chemistry

1 answers

The Km would play a role only if you didn't have saturating conditions. The higher the Km the lower the affinity for the substrate thus for enzyme #2 it is easier to have subsaturating conditions.

Here you say that the conditions are such that there is saturation for both enzymes at all times. So Km doesn't need to be considered and enzyme #2 will catalyze more reactions since you have higher specific activity (for the same amount of total protein).

2007-03-07 21:45:41 · answer #1 · answered by bellerophon 6 · 0 0

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