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Active transport is the process of moving molecules from an area of low concentrations to an area of high concentration. There are two types of active transport, primary active transport and secondary active transport.
Schematic description of the mechanism of the sodium-potassium pump.Four consecutive steps are shown, from left to right. (1) Three sodium ions enter the transporter on the cell internal side.
As four of these monomers come together to form the aquaporin protein, it is known as a homotetramer, meaning it is made up of four identical subunits. [ 15 ] [ 16 ] All aquaporins are tetrameric membrane integral proteins, and the water passes through each individual monomer channel rather than between all of the four channels.
In terms of membrane transport the gradient is of interest as it contributes to decreased system entropy in the co-transport of substances against their gradient. One of the most important pumps in animal cells is the sodium potassium pump , that operates through the following mechanism: [ 9 ]
Meaning T: Thoracic Vertebrae. Testosterone. T x: Treatment: T3 Triiodothyronine: T4 Thyroxine: TA: temporal arteritis T&A: tonsillectomy with adenoidectomy: T&C: type and cross-match (see blood transfusion) T&S: type and screen (blood; e.g., to prepare for blood transfusion) Tab: Tablet (pharmacy) TAB Therapeutic abortion. Threatened abortion ...
In cellular biology, active transport is the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement.
Intracellular transport is an overarching category of how cells obtain nutrients and signals. One very well understood form of intracellular transport is known as endocytosis.
3' untranslated region (3'-UTR). Also three-prime untranslated region, 3' non-translated region (3'-NTR), and trailer sequence.. 3'-end. Also three-prime end.. One of two ends of a single linear strand of DNA or RNA, specifically the end at which the chain of nucleotides terminates at the third carbon atom in the furanose ring of deoxyribose or ribose (i.e. the terminus at which the 3' carbon ...