Multiple Choice
Which of the following posttranslational modifications are removed once a protein arrives at its final destination?
13. Gene Regulation in Eukaryotes
Post Translational Modifications
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Which of the following posttranslational modifications is defined by the addition of phosphates to a protein?
A
Phosphorylation
B
Ubiquitination
C
Signal Sequences
D
Protein Cleavage
Verified step by step guidance1
Understand the concept of posttranslational modifications: These are chemical changes to a protein after it has been synthesized in a cell, which can affect the protein's function, activity, location, or stability.
Identify the specific modification in question: The problem asks about the addition of phosphates to a protein.
Recall the definition of phosphorylation: Phosphorylation is the process of adding a phosphate group (PO4) to a protein or other organic molecule, which is a common way to regulate the activity of proteins.
Differentiate between the options: Ubiquitination involves adding ubiquitin molecules, signal sequences are short peptides that direct the transport of a protein, and protein cleavage involves cutting the protein into smaller segments.
Conclude that phosphorylation is the correct term for the addition of phosphate groups to a protein, as it directly matches the definition provided in the problem.
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