Multiple Choice
Which of the following is correct regarding peripheral membrane proteins?
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6. The Membrane
Types of Membrane Proteins
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Which of the following best describes the function of carrier proteins in cell membranes?
A
They act as enzymes to speed up chemical reactions on the membrane surface.
B
They provide structural support to the cell membrane.
C
They form open channels that allow ions to pass freely.
D
They bind to specific molecules and change shape to transport them across the membrane.
Verified step by step guidance1
Carrier proteins are integral membrane proteins that facilitate the transport of specific molecules across the cell membrane.
These proteins bind to a specific molecule on one side of the membrane, which is often a solute or ion that cannot pass through the lipid bilayer on its own.
Upon binding, the carrier protein undergoes a conformational change, altering its shape to allow the molecule to pass through the membrane.
This process is known as facilitated diffusion, which is a type of passive transport, meaning it does not require energy input from the cell.
Carrier proteins are selective, meaning they only bind to specific molecules, ensuring that the transport across the membrane is regulated and efficient.
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