What is an active transport?

Answer 1

The methods of active transport are endocytosis, phagocytosis, pinocytosis, and exocytosis. Phagocytosis is the ingestion of a smaller cell or cell fragment, a microorganism, or foreign particles by means of the local in folding of a cell's membrane and the protrusion of its cytoplasm around the fold until the material has been surrounded and engulfed by closure of the membrane and formation of a vacuole. Endocytosis is the transport of solid mater of liquid into a cell by means of a coated vacuole or vesicle. Pinocytosis is the transport of fluid into a cell by means of local in foldings by the cell membrane so that a tiny vesicle or sac forms around each droplet, which is then taken into the interior of the cytoplasm. Exocytosis is the transport of material out of a cell by means of a sac or vesicle that first engulfs the material and then is extruded through an opening in the cell membrane.

Answer 2

Active transport mechanisms occur when particles move from a region of lower concentration to one of higher concentration. This requires energy, which comes from cellular metabolism and, specifically, from a molecule called adenosine

triphosphate

(ATP).

Answer 3

Allows molecules to move but requires energy.