Question

multiple choice question the transport mechanism that requires atp input is called: passive transport active transport diffusion osmosis

Explanation:

• Passive transport (like diffusion, osmosis) moves substances down concentration gradients without ATP.
• Active transport requires energy (ATP) to move substances against their concentration gradients.
• Diffusion and osmosis are types of passive transport, so they don't need ATP. Thus, the transport mechanism requiring ATP is active transport.

Answer:

B. active transport (assuming the options are labeled with letters; if the original options had no labels, the answer is "active transport" as the correct choice among the given options: passive transport (incorrect, no ATP), active transport (correct, needs ATP), diffusion (incorrect, passive), osmosis (incorrect, passive)).