AP BIOLOGY

Detailed explanation-1: -This is a type of passive transport in which molecules that cross the cell membrane move quickly due to the presence of specific permeases in the membrane. Facilitated diffusion occurs only in the direction of a concentration gradient and does not require metabolic energy.

Detailed explanation-2: -Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes.

Detailed explanation-3: -Not everything enters the cell through passive transport. Only the smallest molecules like water, carbon dioxide, and oxygen can freely diffuse across cell membranes.

Detailed explanation-4: -Osmosis is a passive transport process during which water moves from areas where solutes are less concentrated to areas where they are more concentrated.

Detailed explanation-5: -Passive transport is defined as movement of a solute from a region of high electrochemical potential on one side of the cell membrane to a region of lower electrochemical potential on the opposite side.