Multiple Choice
The difference between simple and facilitated diffusion is that facilitated diffusion:
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6. Cell Membrane & Transport
Simple and Facilitated Diffusion
Multiple Choice
Which of the following processes includes all of the others?
A
Osmosis
B
Facilitated diffusion
C
Passive transport
D
Transport of an ion down its electrochemical gradient
Verified step by step guidance1
Begin by understanding the concept of passive transport. Passive transport is a type of cellular transport where substances move across cell membranes without the need for energy input from the cell.
Recognize that passive transport includes several processes such as osmosis, facilitated diffusion, and the transport of ions down their electrochemical gradient.
Osmosis is a specific type of passive transport where water molecules move across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Facilitated diffusion is another form of passive transport where molecules move across cell membranes through protein channels or carriers, without energy expenditure, typically down their concentration gradient.
Transport of an ion down its electrochemical gradient is also a passive process, where ions move across membranes driven by both concentration and electrical gradients, without the use of cellular energy.
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