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Passive diffusion lets anything small and nonpolar slip through the membrane’s lipid bilayer. Active transport is the opposite: it’s and always requires a dedicated carrier protein (pump).
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3 Characteristics of Active Transport Cellular survival depends on the precise movement of molecules across biological membranes. While passive transport allows substances to move freely along their natural gradients, cells must frequently move materials against these forces. This vital process is known as active transport.
The protein physically changes shape to carry the cargo across.
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Date: December 14, 2025 The next time you: Passive diffusion lets anything
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