Enzymes & Rate 0.0 / 5 ? ChemistryThread of LifeA2/A-levelOther Created by: J.E.C.Created on: 14-04-14 12:17 Enzymes are __ because they have a ___ ___ that exactly matches the structure of the ___? specific, tertiary structure, substrate 1 of 10 Describe the active site of an enzyme? The cleft on the surface that contains some of the chemical groups and side chains on the amino acid residues which bind the substrate. 2 of 10 The bonds between the active site and substrate are usually...? Hydrogen bonds or interactions between ionic groups. 3 of 10 What is the general rate equation when the substrate concentration is low? rate = k[E][S] 4 of 10 From this rate equation what can we deduce about the rate-determining step? Must involve one enzyme molecule and one substrate molecule. 5 of 10 Why is this the case when substrate concentration is low? Not all enzyme active sites will have a substrate molecule bound to them. 6 of 10 What can you say about the order of reaction with respect to the substrate? First order 7 of 10 If the substrate concentration is high, the rate equation becomes...? rate = k[E] 8 of 10 With plenty of substrate, the first step is no longer the ___ ___ ___, what is more important now is the speed of breakdown of __ and __? rate-determining step, ES & EP 9 of 10 The rate of this breakdown depends on __, so the reaction rate no longer depends on [S] so it is __ __ with respect to [S]. [E], zero order 10 of 10
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