Multiple Choice
Which of the following best describes simple diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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What role do carrier proteins play in facilitated diffusion?
A
They provide a pathway for molecules to passively move down their concentration gradient.
B
They use ATP to pump molecules across the membrane.
C
They actively transport molecules against their concentration gradient.
D
They create a pore in the membrane for ions to pass through.
Verified step by step guidance1
Facilitated diffusion is a type of passive transport that allows molecules to move across the cell membrane without the use of energy (ATP).
Carrier proteins are integral membrane proteins that assist in facilitated diffusion by providing a specific pathway for certain molecules to pass through the membrane.
These proteins bind to the molecules on one side of the membrane, undergo a conformational change, and release the molecules on the other side, allowing them to move down their concentration gradient.
Unlike active transport, facilitated diffusion does not require energy input because the molecules are moving from an area of higher concentration to an area of lower concentration.
Carrier proteins are specific to the molecules they transport, ensuring that only certain substances can pass through the membrane via facilitated diffusion.
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