Membrane transporters are molecular machines that couple active transport of their specific substrates to various sources of cellular energy through a set of highly coordinated protein conformational changes. Th
Accordingly, Mitchelllikened the oxido/reduction and phosphorylation processes in his chemiosmotic hypothesis to a protonic fuel cell in which ATP synthesis was construed as a vectorial reaction driven by a ``proton-motive'' force across the mitochondrial membrane....
across cell membrane differ in(a) passive transport is nonselective(b) passive transport is along the concentration gradient while active transport is due to metabolic energy(c) active transport is more rapid(d) passive transport is confined to anions while active transport in confined to cations....
Active transport is defined as a process in which substances move across a biological membrane against a concentration gradient, relying on the cell's metabolic energy. This process involves carriers that bind to the substance to be transported and facilitate its movement across the membrane. ...
active transport The molecules move from low concentration to high concentration Do active transports require energy? Yes What do the molecules use to get across the membrane in active transport ATP Exyocytosis Movement of molecules out of the cell using a vesicle Does exocytosis require energy? Ye...
Secondary active transport brings sodium ions, and possibly other compounds, into the cell. As sodium ion concentrations build outside of the plasma membrane because of the action of the primary active transport process, an electrochemical gradient is created. If a channel protein exists and is ope...
of sugar, Kinter and Wilson suggest that, in the intestine, an intracellularly directed sugar pump "is present along the entire cell membrane, the net movement from lumen to blood being due to the far greater surface area because of the microvilli at the luminal border of the cell" 4 .doi...
Primary active transport of pravastatin across the liver canalicular membrane in normal and mutant Eisai hyperbilirubinemic rats. Biopharm. Drug Dispos. 17, 607-621.Yamazaki M, Kobayashi K, Sugiyama Y. Primary active trans- port of pravastatin across the liver canalicular membrane in nor- mal an...
Which of the following transport mechanisms requires ATP to move materials across a plasma membrane? a) simple diffusion b) facilitated diffusion c) osmosis d) active transport What is the name given to the movement of substances across a cell membrane without the use of energy by the cell?
The relationship of a (Mg2++Na+)-activated K+ stimulated enzyme or enzyme system to the active linked transport of Na+ and K+ across the cell membrane Membrane Transport and Metabolism, Academic Press, London (1961), p. 228 Google Scholar Skou, 1962 Skou J.C. Preparation from mammalian ...