Answer :
if an animal cell suddenly loses the ability to produce GTP. It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane.
G proteins, sometimes referred to as guanine nucleotide-binding proteins, are a family of proteins that function as molecular switches within cells, relaying signals from a range of stimuli outside a cell to its interior.
Their ability to bind to and hydrolyze guanosine triphosphate (GTP) to guanosine diphosphate is governed by several different variables (GDP). They are "on" when they are bound to GTP and "off" when they are bound to GDP. The wider class of enzymes known as GTPases includes G proteins.
Thus, when the cell will not produce GTP then these G protein receptors are not activated and thus signalling will not be carried further.
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