Multiple Choice
In the context of phosphorylation-based signal transduction, what is the primary role of activated protein kinases in a cell?
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7. Enzyme Inhibition and Regulation
Phosphorylation
Multiple Choice
In the context of phosphorylation, what does a protein kinase do?
A
Hydrolyzes to generate as a second messenger
B
Transfers a phosphate group, typically from , to a target protein residue (e.g., Ser, Thr, or Tyr)
C
Removes a phosphate group from a phosphorylated protein, releasing inorganic phosphate
D
Binds DNA and directly increases transcription of the kinase target gene
Verified step by step guidance1
Understand that phosphorylation is a biochemical process where a phosphate group is added to a molecule, often regulating protein function.
Recognize that a protein kinase is an enzyme that catalyzes the transfer of a phosphate group from a high-energy donor molecule, usually ATP, to specific amino acid residues on a target protein.
Identify the common amino acid residues that are phosphorylated by kinases, which typically include serine (Ser), threonine (Thr), and tyrosine (Tyr).
Note that the phosphate group transfer modifies the target protein's activity, localization, or interaction with other molecules, thereby regulating cellular processes.
Distinguish protein kinases from other enzymes such as phosphatases (which remove phosphate groups) and enzymes involved in generating second messengers like cAMP.
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