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Questions and Answers
What is a necessary step for hydrophilic extracellular signal molecules to induce a response in target cells?
What is a necessary step for hydrophilic extracellular signal molecules to induce a response in target cells?
- They must bind to a cell-surface receptor (correct)
- They must travel through the plasma membrane on their own
- They must be transported into the cytosol by their receptor
- They must bind to a receptor in the cytosol
What is a common characteristic of all extracellular signal molecules?
What is a common characteristic of all extracellular signal molecules?
- They are always transported into the cytosol
- They are always recognized by the immune system
- They must bind to a cell-surface receptor (correct)
- They are always hydrophobic
What is the relationship between a cell-surface receptor and the response it mediates?
What is the relationship between a cell-surface receptor and the response it mediates?
- Receptors have no influence on the response of a cell
- A single receptor can mediate only one response
- Multiple receptors can mediate a single response
- A single receptor can mediate multiple responses (correct)
What is the response of a cell when a foreign substance binds to a receptor for a normal signal molecule?
What is the response of a cell when a foreign substance binds to a receptor for a normal signal molecule?
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What is the function of a receptor in signal transduction?
What is the function of a receptor in signal transduction?
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