What is the significance of being able to gate a channel protein in a cell membrane?

• A. It prevents the channel protein from being embedded in the membrane.
• B. It allows the cell to regulate the flow of specific ions or molecules in response to environmental or cellular signals.
• C. It enables the channel protein to synthesize ATP directly.
• D. It increases the rate of passive diffusion across the lipid bilayer.

Answer: (B)

Verified step by step guidance

1. Understand the role of channel proteins: Channel proteins are integral membrane proteins that facilitate the transport of specific ions or molecules across the cell membrane. They are essential for maintaining cellular homeostasis.
2. Define gating in channel proteins: Gating refers to the ability of channel proteins to open or close in response to specific stimuli, such as changes in voltage, ligand binding, or mechanical stress. This gating mechanism is crucial for regulating the flow of substances.
3. Analyze the significance of gating: Gating allows the cell to control the movement of ions or molecules, ensuring that transport occurs only when needed. This regulation is vital for processes like signal transduction, maintaining ion gradients, and responding to environmental changes.
4. Eliminate incorrect options: Review the provided options and eliminate those that do not align with the function of gating. For example, gating does not prevent the protein from being embedded in the membrane, nor does it enable ATP synthesis directly. Additionally, gating does not increase the rate of passive diffusion, as it involves controlled transport rather than passive movement.
5. Select the correct answer: Based on the analysis, the correct significance of gating is that it allows the cell to regulate the flow of specific ions or molecules in response to environmental or cellular signals. This ensures precise control over cellular activities and maintains homeostasis.