AP BIOLOGY

Detailed explanation-1: -Passive transport does not require the cell to expend any energy and involves a substance diffusing down its concentration gradient across a membrane.

Detailed explanation-2: -Passive transport: This does not require any energy expenditure as it occurs along the concentration gradient of the molecule being translocated. Examples include simple diffusion, facilitated diffusion, and osmosis.

Detailed explanation-3: -Facilitated diffusion does not need any energy for the movement of molecules as they move from higher concentration to lower concentration gradient. This means they obey Fick’s law.

Detailed explanation-4: -Simple diffusion does not require energy: facilitated diffusion requires a source of ATP. B. Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient.

Detailed explanation-5: -Facilitated is a transport that does not require energy. It moves down the concentration gradient. It moves with the help of carrier protein. It is used for ions that can’t move quickly against the membrane.