1. The addition of a phosphate group to a substrate protein: (select any/all answers that apply) A. will oftentimes affect the activity of that protein. B. is catalyzed by a phosphatase. C. is catalyzed by a ubiquitin ligase. D. can act as a kind of "molecular switch". E. can sometimes serve as a "docking site", recruiting other proteins or molecules to the phosphorylated substrate protein. 2. All receptor proteins: (select any/all answers that apply) A. recognize and bind to specific extracellular chemicals. B. recognize and bind to specific intracellular chemicals. C. recognize and bind to specific ligands. D. are integral membrane proteins. E. are enzymes.
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Will oftentimes affect the activity of that protein - This is true, as phosphorylation can change the conformation and activity of a protein. B. Is catalyzed by phosphatase - This is false, as phosphatases remove phosphate groups. Kinases are responsible for Show more…
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