Multiple Choice
Which of the following is required for active transport to occur across a cell membrane?
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6. The Membrane
Passive vs. Active Transport
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Which of the following is an example of a passive membrane transport process?
A
Endocytosis
B
Simple diffusion
C
Exocytosis
D
Sodium-potassium pump activity
Verified step by step guidance1
Step 1: Understand the concept of passive membrane transport. Passive transport is a process that does not require energy (ATP) and occurs due to the natural movement of molecules down their concentration gradient (from high to low concentration). Examples include simple diffusion, facilitated diffusion, and osmosis.
Step 2: Analyze the options provided. Endocytosis and exocytosis are active transport processes that require energy to move substances into or out of the cell, respectively. The sodium-potassium pump is also an active transport mechanism that uses ATP to move ions against their concentration gradient.
Step 3: Focus on simple diffusion. Simple diffusion is a passive transport process where molecules move directly through the lipid bilayer of the cell membrane without the need for energy or transport proteins.
Step 4: Compare simple diffusion to the other options. Unlike the active processes listed (endocytosis, exocytosis, and sodium-potassium pump activity), simple diffusion aligns with the definition of passive transport as it does not require energy and occurs naturally.
Step 5: Conclude that the correct answer is simple diffusion, as it is the only example of a passive membrane transport process among the options provided.
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