Multiple Choice
In the context of cell signaling, which of the following best explains why an infant might become unresponsive to a hormone after repeated exposure?
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10. Cell Signaling
Introduction to Cell Signaling
Multiple Choice
Which of the following best describes the role of a ligand in cell signaling?
A
A ligand binds to a receptor to initiate a cellular response.
B
A ligand is a type of enzyme that catalyzes signal transduction.
C
A ligand is a structural protein that maintains cell shape.
D
A ligand acts as a membrane channel for ions.
Verified step by step guidance1
Step 1: Understand the concept of cell signaling. Cell signaling is the process by which cells communicate with each other to coordinate various functions. It typically involves a signaling molecule (ligand), a receptor, and a cellular response.
Step 2: Define what a ligand is. A ligand is a molecule that binds specifically to a receptor on the surface or inside a cell. This binding triggers a series of events leading to a cellular response.
Step 3: Analyze the options provided. Evaluate each statement to determine which one accurately describes the role of a ligand in cell signaling. For example, a ligand is not an enzyme, structural protein, or membrane channel.
Step 4: Focus on the correct description. The correct role of a ligand is to bind to a receptor, which initiates a signal transduction pathway resulting in a cellular response.
Step 5: Conclude that the correct answer is: 'A ligand binds to a receptor to initiate a cellular response,' as this aligns with the biological function of ligands in cell signaling.
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