Multiple Choice
In the context of phosphorylation, what is a protein kinase?
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7. Enzyme Inhibition and Regulation
Phosphorylation
Multiple Choice
In the context of phosphorylation, what is a protein kinase?
A
A protein that binds phosphate groups to store energy without catalyzing any chemical reaction
B
An enzyme that synthesizes by phosphorylating using a proton gradient
C
An enzyme that transfers a phosphate group from to a target protein (often on Ser, Thr, or Tyr residues)
D
An enzyme that removes phosphate groups from phosphorylated proteins, typically releasing inorganic phosphate
Verified step by step guidance1
Understand the role of phosphorylation in biochemistry: it is a process where a phosphate group is added to a molecule, often regulating protein function.
Recognize that a protein kinase is an enzyme involved in phosphorylation, specifically transferring phosphate groups.
Identify the phosphate donor in this process, which is typically adenosine triphosphate (ATP).
Know that protein kinases transfer the phosphate group from ATP to specific amino acid residues on target proteins, commonly serine (Ser), threonine (Thr), or tyrosine (Tyr).
Conclude that a protein kinase catalyzes the transfer of a phosphate group from ATP to a protein, modifying the protein's activity or function.
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