Cell transport mechanisms: Movement of a cell or solute against its concentration gradient is called what? Context: Transport occurs from lower to higher concentration and requires metabolic energy (ATP). Choose the correct term.

Given data

• Direction: against the concentration gradient (low → high concentration).

Concept / Approach
Transport uphill requires energy input (often ATP hydrolysis) mediated by pumps/carriers (e.g., Na⁺/K⁺-ATPase). This is termed active transport.

Contrast
Diffusion/osmosis/facilitated diffusion are passive; they move down gradients and do not require cellular energy.

Final Answer
Active transport.