Multiple Choice
Which of the following is NOT a type of passive transport?
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6. The Membrane
Passive vs. Active Transport
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Carbon dioxide most likely enters a cell through which of the following processes?
A
Endocytosis
B
Simple diffusion
C
Active transport
D
Facilitated diffusion
Verified step by step guidance1
Understand the nature of carbon dioxide: Carbon dioxide (CO₂) is a small, nonpolar molecule, which means it can easily pass through the lipid bilayer of the cell membrane without requiring energy or assistance from transport proteins.
Review the process of simple diffusion: Simple diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration directly through the cell membrane. This process does not require energy (passive transport) or specialized proteins.
Eliminate endocytosis: Endocytosis is a process where the cell engulfs large particles or molecules using vesicles. Since CO₂ is a small molecule, this process is not applicable.
Eliminate active transport: Active transport requires energy (ATP) to move molecules against their concentration gradient. CO₂ moves passively along its concentration gradient, so active transport is not involved.
Eliminate facilitated diffusion: Facilitated diffusion involves transport proteins to help move molecules across the membrane. Since CO₂ is nonpolar and small, it does not require transport proteins and can diffuse directly through the membrane via simple diffusion.
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