Active transport

A) moves molecules or ions along their concentration gradient.
B) involves carbohydrate pumps.
C) is associated with large numbers of mitochondria.
D) is associated with fat and skin cells.
E) cannot be done by animal cells.

Active Transport

The movement of molecules across a cell membrane from a lower to a higher concentration, requiring energy.

Mitochondria

Organelles within cells that are the sites of aerobic respiration, providing energy for cellular functions.

Concentration Gradient

A variation in the concentration of a substance across a distance, leading to the movement of particles from an area of high concentration to one of lower concentration.