THE CELL
CELL COMMUNICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane.
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It could activate only the epinephrine system.
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It would be able to carry out reception and transduction, but would not be able to respond to a signal.
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Detailed explanation-1: -Which of the following is true for the signaling system in an animal cell that lacks 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.
Detailed explanation-2: -Without a GTP molecule, the protein will not activate or inactivate.
Detailed explanation-3: -GTP-binding proteins or G proteins are transmitting signals outside the cell which cause changes within the cell. They act as molecular switches which are on when binding GTP and off when binding GDP.
Detailed explanation-4: -Answer and Explanation: If a target cell lacks receptors for local regulators, the cell will not be able to interact with the hormone. The hormone might still be able to diffuse inside the cell because hormones are hydrophobic and can easily diffuse into sales.
Detailed explanation-5: -How would the signal of a G protein-coupled receptor, without ligand, be affected if you made a G protein that converted GDP to GTP on its own without needing to be activated by the G protein-coupled receptor? The G protein would be active and signaling, despite the lack of ligand.