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?
6. Enzymes and Enzyme Kinetics
Electrostatic and Metal Ion Catalysis
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple 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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