Biology CLEP Prep Practice Exam

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Are you gearing up for the Biology CLEP exam? Prepare like a pro with our Biology CLEP Prep Practice Exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What process allows cells to actively transport substances against their concentration gradient?

OSMOSIS
Diffusion
Endocytosis
Active transport

The correct answer is: Active transport

Active transport is the only process listed that involves active and energy-requiring transport of substances against their concentration gradient. Osmosis, diffusion, and endocytosis are all passive processes that do not require energy and only move substances along their concentration gradient. This is why they are incorrect choices.