Why Are Phosphorylation and Dephosphorylation Reactions Commonly Used to Regulate

question 36

Multiple Choice

Why are phosphorylation and dephosphorylation reactions commonly used to regulate signal transduction pathways?

• A)Phosphate groups are efficient second messengers
• B)Protein kinases and phosphatases are abundant in most cells
• C)The hydrolysis of bound GTP generates GDP,which can change the activity of proteins bound to GDP
• D)The addition or removal of a phosphate group can expose or hide potential binding sites in proteins or change protein activity

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