Active Transport is best described as which statement?

• A. Use Energy To Move Through The Plasma Membrane
• B. Occur Without Energy
• C. Move Water Across A Membrane
• D. Is A Form Of Diffusion

Answer: (A)

Active transport relies on energy input to push substances across the plasma membrane against their concentration gradient, usually through membrane pumps or transporters. That energy requirement is what defines it and makes it distinct from passive processes. So the statement that active transport uses energy to move through the plasma membrane is the best description. In contrast, moving water across a membrane occurs by osmosis (a passive process), and diffusion is the passive spreading of particles down their gradient. The energy-use description precisely captures what makes active transport unique.