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Question: One way of expressing the rate at which an enzyme can catalyze a reaction is to give its turnover number. The turnover number is the maximum number of substrate molecules that can be acted on by one molecule of enzyme per unit of time. The following table gives the turnover number of some representative enzymes.
Enzyme
Substrate
Turnover Number (per second)
Ribonuclease
RNA
100
Fumarase
Fumarate
800
Lactate Dehydrogenase
Lactate
1,000
Urease
Urea
10,000
How many molecules of urea can one molecule of urease act on in 21 minutes?
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