Multiple Choice
Catalysis by the enzyme urease is inhibited in the presence of Hg, Cd, or Co ions. What could this information potentially suggest about the catalytic mechanism of urease?
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6. Enzymes and Enzyme Kinetics
Electrostatic and Metal Ion Catalysis
Multiple Choice
Which of the following best applies to metal ion catalysis?
A
A covalent bond forms between enzyme and substrate.
B
Catalyst may participate in oxidation-reduction reactions by changes in the oxidation state.
C
May use amino acids such as aspartate or lysine for protonation or proton abstraction.
D
Uses nucleophilic functional groups.
E
Lowers the energy of the transition state.
F
a & d.
G
b & e.
Verified step by step guidance1
Understand the concept of metal ion catalysis: Metal ions can act as catalysts in biochemical reactions by stabilizing charged intermediates, participating in oxidation-reduction reactions, or helping to orient substrates properly.
Identify the role of metal ions in oxidation-reduction reactions: Metal ions can change their oxidation state, which allows them to participate in electron transfer processes. This is a key feature of metal ion catalysis.
Recognize the role of metal ions in lowering the energy of the transition state: Metal ions can stabilize the transition state of a reaction, effectively lowering the activation energy required for the reaction to proceed.
Evaluate the given options: Option b ('Catalyst may participate in oxidation-reduction reactions by changes in the oxidation state') and option e ('Lowers the energy of the transition state') both describe characteristics of metal ion catalysis.
Conclude that the correct answer is b & e, as these options accurately reflect the roles that metal ions play in catalysis.
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