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Cell Signalling and Transduction - Medical Science

Q1:

Which of the following statements about G proteins is false?

A They are involved in signal cascades

B They bind to and are regulated by guanine nucleotides

C They become activated when bound to GDP

D They must be active before the cell can make needed cAMP

ANS:C - They become activated when bound to GDP

G protein gets activated when they are bound to to GTP not GDP. Gprotein activate when they bound to GTP.