Multiple Choice
Covalent modification of an enzyme usually involves phosphorylation / dephosphorylation of:
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7. Enzyme Inhibition and Regulation
Phosphorylation
Multiple Choice
In the context of phosphorylation, what is a protein kinase?
A
An enzyme that removes phosphate groups from proteins by hydrolysis
B
An enzyme that catalyzes transfer of a phosphate group, typically from ATP, to a specific substrate protein or other molecule
C
A small molecule that donates phosphate groups to ATP during oxidative phosphorylation
D
A structural protein that stores phosphate groups for later use in signaling pathways
Verified step by step guidance1
Understand the role of phosphorylation in cellular processes: it involves adding a phosphate group to a molecule, often regulating protein function and signaling pathways.
Recall that enzymes facilitating phosphorylation are called kinases, which catalyze the transfer of phosphate groups.
Recognize that protein kinases specifically transfer a phosphate group from a donor molecule, usually ATP, to a target protein, modifying its activity.
Differentiate protein kinases from phosphatases, which remove phosphate groups by hydrolysis, and from other molecules that might store or donate phosphate groups in different contexts.
Conclude that a protein kinase is an enzyme that catalyzes the transfer of a phosphate group, typically from ATP, to a specific substrate protein or molecule, thereby regulating its function.
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