Multiple Choice
Which of the following are types of passive transport across cell membranes?
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6. The Membrane
Passive vs. Active Transport
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Which of the following statements correctly describes facilitated diffusion?
A
It allows substances to move from areas of low concentration to high concentration.
B
It requires energy in the form of ATP to transport molecules against their concentration gradient.
C
It is a passive transport process that requires membrane proteins to move substances across the cell membrane.
D
It involves the movement of water molecules only through the lipid bilayer.
Verified step by step guidance1
Facilitated diffusion is a type of passive transport, meaning it does not require energy input (such as ATP) to move substances across the cell membrane.
In facilitated diffusion, substances move down their concentration gradient, from areas of high concentration to areas of low concentration, without the need for energy.
This process requires the assistance of specific membrane proteins, such as channel proteins or carrier proteins, to help transport molecules that cannot pass directly through the lipid bilayer due to their size, charge, or polarity.
Facilitated diffusion is not limited to water molecules; it can involve various substances like ions, glucose, and amino acids that need assistance to cross the membrane.
The statement that correctly describes facilitated diffusion is: 'It is a passive transport process that requires membrane proteins to move substances across the cell membrane.'
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