Multiple Choice
Nitric oxide is unusual among animal signal molecules in that it __________.
10. Cell Signaling
Types of Cell Signaling
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The binding of a signal molecule to a ligand-gated ion channel __________.
A
causes the ion channel to phosphorylate an amino acid on a target molecule
B
results in the formation of ion-channel dimers
C
promotes the binding of a steroid hormone to its receptor in the cytoplasm
D
alters the expression of genes, especially in neurons
E
affects the membrane potential
Verified step by step guidance1
Understand the function of ligand-gated ion channels: These are a type of membrane protein that open or close in response to the binding of a chemical messenger (ligand), such as a neurotransmitter.
Recognize the role of signal molecules: Signal molecules bind to these channels, causing them to open or close, which allows ions to pass through the membrane.
Identify the effect on membrane potential: The movement of ions across the membrane alters the membrane potential, which is the electrical charge difference across the cell membrane.
Consider the impact on cellular activity: Changes in membrane potential can lead to various cellular responses, including the initiation of action potentials in neurons.
Clarify misconceptions: The binding of a signal molecule to a ligand-gated ion channel does not directly cause phosphorylation, dimer formation, steroid hormone binding, or gene expression changes. Its primary effect is on membrane potential.
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