Question

definition
characteristics
word
active transport
examples
non - examples

Explanation:

Active transport is the movement of molecules or ions across a cell membrane from an area of lower concentration to an area of higher concentration, requiring energy (usually in the form of ATP). Characteristics include the use of carrier - proteins and energy expenditure. Examples are the sodium - potassium pump in nerve cells and the uptake of glucose in intestinal cells against the concentration gradient. Non - examples are simple diffusion and facilitated diffusion which do not require energy and move substances down the concentration gradient.

Answer:

Definition: The movement of molecules or ions across a cell membrane from low to high concentration, requiring energy.
Characteristics: Uses carrier - proteins, requires energy (ATP).
Examples: Sodium - potassium pump, glucose uptake in intestinal cells.
Non - Examples: Simple diffusion, facilitated diffusion.