Textbook Question
Which of the following processes includes all the others?
a. Osmosis
b. Diffusion of a solute across a membrane
c. Passive transport
d. Transport of an ion down its electrochemical gradient
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6. The Membrane
Passive vs. Active Transport
Multiple Choice
Which of the following is not a form of passive transport?
A
Diffusion
B
Facilitated diffusion
C
Endocytosis
D
Osmosis
Verified step by step guidance1
Understand the concept of passive transport: Passive transport is the movement of molecules across a cell membrane without the need for energy input from the cell. It relies on the concentration gradient, moving substances from an area of higher concentration to an area of lower concentration.
Identify the types of passive transport: The main types of passive transport include diffusion, facilitated diffusion, and osmosis. Each of these processes allows substances to move across cell membranes without energy expenditure.
Define diffusion: Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until equilibrium is reached. It is a fundamental form of passive transport.
Define facilitated diffusion: Facilitated diffusion is similar to diffusion but involves the use of transport proteins to help move substances across the cell membrane. It is still considered passive because it does not require energy.
Define osmosis: Osmosis is a specific type of diffusion that refers to the movement of water molecules through a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.
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