Question

what process is powered by atp and allows molecules to move against a concentration gradient?
osmosis
passive transport
active transport

Explanation:

1. Recall the definitions of the processes:

• Osmosis is the diffusion of water across a semi - permeable membrane, it is a type of passive transport and does not require ATP. It also moves along the concentration gradient of water.
• Passive transport (including simple diffusion and facilitated diffusion) moves molecules along their concentration gradient and does not require energy (ATP).
• Active transport is the process that requires energy (usually in the form of ATP) and moves molecules against their concentration gradient (from an area of lower concentration to an area of higher concentration).

Answer:

Active transport