Open Question
Complete the table by answering yes or no for each question. <IMAGE>
6. Cell Membrane & Transport
Simple and Facilitated Diffusion
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Which of the following does not accurately describe a channel or a carrier?
A
Channel – open to both sides of the membrane simultaneously.
B
Carrier – open to one side of the membrane at a time.
C
Carrier – requires a conformation change to complete function.
D
Channel – not selective for molecules that move through it.
Verified step by step guidance1
Understand the basic definitions: Channels and carriers are types of transport proteins that facilitate the movement of substances across cell membranes.
Channels are typically open to both sides of the membrane simultaneously, allowing molecules to pass through without significant structural changes.
Carriers, on the other hand, bind to specific molecules and undergo a conformational change to transport the molecule across the membrane, opening to one side at a time.
Consider the selectivity: Channels are usually selective for specific ions or molecules, allowing only certain substances to pass through based on size, charge, or other properties.
Evaluate the statement: 'Channel – not selective for molecules that move through it' is inaccurate because channels are generally selective, contrary to what the statement suggests.
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