Multiple Choice
Which of the following is not a passive process in cellular transport?
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6. The Membrane
Passive vs. Active Transport
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In which situation would passive transport not use a transport protein for entry into a cell?
A
Endocytosis of large particles into the cell
B
Diffusion of oxygen molecules across the cell membrane
C
Active transport of sodium ions out of the cell
D
Facilitated diffusion of glucose into the cell
Verified step by step guidance1
Understand the concept of passive transport: Passive transport is the movement of molecules across the cell membrane without the use of energy by 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 are simple diffusion, facilitated diffusion, and osmosis. Simple diffusion does not require a transport protein, while facilitated diffusion does.
Analyze the options given: Endocytosis and active transport are not passive transport processes. Facilitated diffusion requires a transport protein, so it is not the correct answer.
Focus on simple diffusion: Simple diffusion involves the movement of small or nonpolar molecules, such as oxygen, directly through the lipid bilayer of the cell membrane without the need for a transport protein.
Conclude with the correct situation: The diffusion of oxygen molecules across the cell membrane is an example of simple diffusion, where no transport protein is needed, making it the correct answer.
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