Multiple Choice
Which of the following correctly describes the target cells in autocrine signaling?
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10. Cell Signaling
Introduction to Cell Signaling
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Which is true of the GTP-binding proteins that participate in intracellular signaling?
A
They are permanently active and do not require GTP binding.
B
They function independently of any external signals.
C
They act as molecular switches that are active when bound to GTP.
D
They are only found in prokaryotic cells.
Verified step by step guidance1
Understand that GTP-binding proteins, also known as G-proteins, are involved in transmitting signals from outside the cell to the inside, acting as molecular switches.
Recognize that these proteins are active when bound to guanosine triphosphate (GTP) and inactive when bound to guanosine diphosphate (GDP).
Note that the binding of GTP to the protein induces a conformational change, activating the protein to relay signals within the cell.
Realize that GTP-binding proteins are not permanently active; they require the binding of GTP to switch from an inactive to an active state.
Acknowledge that GTP-binding proteins are found in both eukaryotic and prokaryotic cells, but they are not exclusive to prokaryotes.
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