Figure A shows a protein consisting of two identical subunits.Figure B shows the same protein after each subunit has been covalently modified with a phosphate group. Based on the activities shown in the diagrams, what biological advantage does this protein gain by having the ability to undergo a reversible phosphorylation-dephosphorylation reaction?

Question

Figure A shows a protein consisting of two identical subunits.Figure B shows the same protein after each subunit has been covalently modified with a phosphate group.  Based on the activities shown in the diagrams, what biological advantage does this protein gain by having the ability to undergo a reversible phosphorylation-dephosphorylation reaction?

Quizplus · Accepted Answer

The reversible phosphorylation-dephosphorylation reaction provides a mechanism for regulating substrate binding. When a phosphate group is added or removed from the protein, it can cause a conformational change that affects the protein's ability to bind to its substrate. This allows the protein to respond to signals and adjust its activity accordingly.

Figure a Shows a Protein Consisting of Two Identical Subunits