AP BIOLOGY

Detailed explanation-1: -Osmosis is passive diffusion . In osmosis, water moves from high concentration to low concentration through a semi-permeable membrane. Osmosis does not require energy, i.e. ATP for the movement.

Detailed explanation-2: -Channel proteins are not used in active transport because substances can only move through them along the concentration gradient.

Detailed explanation-3: -Osmosis is a passive form of transport that results in equilibrium, but diffusion is an active form of transport. 2. Osmosis only occurs when a semi-permeable membrane is present, but diffusion can happen whether or not it is present.

Detailed explanation-4: -There are three main active transport methods-ion pumps, exocytosis and endocytosis.

Detailed explanation-5: -Answer and Explanation: The correct answer is option C. Endocytosis is a form of active transport. Endocytosis is the biological process wherein molecules in the extracellular environment are taken in by the cell.