Multiple choice

Movement of cell against concentration gradient is called

  1. osmosis

  2. diffusion

  3. active transport

  4. passive transport

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Active transport is the movement of molecules across a cell membrane against their concentration gradient (from low to high concentration). This requires energy (ATP). Osmis and diffusion are passive processes (with the gradient), and passive transport also moves down the gradient.