Multiple Choice
During kinase phosphorylation, which phosphate group is removed from ATP in the figure below?
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7. Enzyme Inhibition and Regulation
Phosphorylation
Multiple Choice
In the context of phosphorylation, what is the primary function of a protein kinase?
A
To catalyze the transfer of a phosphate group from to a specific amino acid residue on a target protein
B
To remove phosphate groups from phosphorylated proteins (dephosphorylation)
C
To hydrolyze solely to generate heat without modifying other molecules
D
To synthesize from and inorganic phosphate during oxidative phosphorylation
Verified step by step guidance1
Understand that phosphorylation is a biochemical process where a phosphate group is added to a molecule, often a protein, which can alter the protein's function or activity.
Recognize that protein kinases are enzymes specifically involved in phosphorylation, meaning they facilitate the addition of phosphate groups to proteins.
Identify the phosphate donor in this reaction, which is typically adenosine triphosphate (ATP), a molecule that carries high-energy phosphate bonds.
Know that the protein kinase catalyzes the transfer of the terminal phosphate group from ATP to a specific amino acid residue (such as serine, threonine, or tyrosine) on the target protein.
Conclude that the primary function of a protein kinase is to catalyze this transfer, thereby modifying the target protein's activity, rather than removing phosphate groups, hydrolyzing ATP without transfer, or synthesizing ATP.
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