Multiple Choice
Glycosylation is the post-translational addition of ________ to the protein.
15. Gene Expression
Post-Translational Modification
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Which of the following is a reversible form of post-translational modification which can activate or deactivate a protein depending on the protein which is being modified?
A
Glycosylation.
B
Ubiquitination.
C
Acetylation.
D
Phosphorylation.
Verified step by step guidance1
Understand the concept of post-translational modification: These are chemical changes to a protein after it has been synthesized, which can affect the protein's function, activity, or location.
Identify reversible modifications: Some modifications can be reversed, meaning they can be added and removed, allowing proteins to be activated or deactivated as needed.
Explore phosphorylation: Phosphorylation involves the addition of a phosphate group (PO₄³⁻) to a protein, typically on serine, threonine, or tyrosine residues. This modification is reversible and can alter the protein's function.
Consider the role of kinases and phosphatases: Kinases are enzymes that add phosphate groups, while phosphatases remove them, making phosphorylation a dynamic and reversible process.
Compare with other modifications: Glycosylation, ubiquitination, and acetylation are other forms of post-translational modifications, but phosphorylation is unique in its reversible nature and ability to regulate protein activity.
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