BIOL 150 Chapter Notes - Chapter 38: Symporter, Stoma, Symplast
Document Summary
Active transport - the movement of ions or molecules across a membrane against an electrochemical gradient. Requires energy (e. g. , from hydrolysis of atp) and assistance of a transport protein (e. g. , pump). Apoplast - in plants, the region outside plasma membranes consisting of the porous cell walls and the intervening extracellular air space. Bulk flow - the directional mass movement of a fluid due to pressure differences, such as movement of water through plant xylem and phloem, and movement of blood in animals. C4 photosynthesis - a variant type of photosynthesis in which atmospheric co2 is first fixed into four-carbon sugars, rather than the three-carbon sugars of classic c3 photosynthesis. Enhances photosynthetic efficiency in hot, dry environments by reducing loss of oxygen due to photorespiration. Capillarity - the tendency of water to move up a narrow tube due to adhesion, cohesion, and surface tension (also called capillary action).
