[Campbell Biology P.267] What molecule, when bound to a G protein, indicates that the G prot... | Practice Question

What molecule, when bound to a G protein, indicates that the G protein is in its inactive state?

  • A: GTP
  • B: GDP
  • C: ATP
  • D: Inorganic phosphate (P_i)

Explanation

The text explicitly states in step 1 that 'When GDP is bound to the G protein, as shown above, the G protein is inactive.' This makes GDP the key indicator of the inactive state.