Multiple Choice
In allosteric regulation, which molecules modify the rate of enzyme activity by binding at a site other than the active site?
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7. Enzyme Inhibition and Regulation
Allosteric Regulation
Multiple Choice
In the context of allosteric regulation, what can cause an enzyme to change its shape (conformation) and thereby alter its activity?
A
Formation of a covalent peptide bond between the enzyme and its substrate during catalysis
B
Conversion of substrate into product at the active site without any regulatory ligand binding
C
Binding of an allosteric effector (activator or inhibitor) at a site other than the active site
D
Spontaneous isomerization of the enzyme that is independent of ligand binding and has no effect on activity
Verified step by step guidance1
Understand that allosteric regulation involves the binding of molecules (effectors) at specific sites on the enzyme that are distinct from the active site, called allosteric sites.
Recognize that when an allosteric effector binds to the enzyme at the allosteric site, it induces a conformational change in the enzyme's structure.
This conformational change can either increase (activation) or decrease (inhibition) the enzyme's catalytic activity by altering the shape or dynamics of the active site.
Note that formation of a covalent peptide bond between enzyme and substrate is part of catalysis but does not represent allosteric regulation or conformational change caused by regulatory molecules.
Also understand that spontaneous isomerization without ligand binding does not affect enzyme activity, and conversion of substrate to product at the active site is a normal catalytic process, not a regulatory conformational change.
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