This pore has specific charges and amino acids that allow for the transport of specific substances through the channel. Facilitated diffusion occurs without additional energy input because it moves molecules down their concentration gradient from an area of high concentration to an area of low ...
解析 Answer:F;thedirectionofmovementdependsonboththeconcentrationgradientandthemembranepotential,sofacilitateddiffusioncanoccurfromacompartmentoflowerconcentrationtoacompartmentofhigherconcentrationifthemembranepotentialisintherightdirectionandofsufficientmagnitude.结果一 题目 Facilitated diffusion of a cation occurs only fr...
FacilitatedDiffusionMovementofspecificmoleculesacrosscellmembranesthroughproteinchannels Eachproteinchannelonlyallowsaparticularsubstancestocross.Theproteinfacilitates(helps)thediffusionacrossthemembrane FacilitatedDiffusionandEnergy Occurswiththefollowing:1.Chargedmolecules(ions)2.Whenmoleculesaretoolarge ...
FacilitatedDiffusion FacilitatedDiffusionMovementofspecificmoleculesacrosscellmembranesthroughproteinchannels Eachproteinchannelonlyallowsaparticularsubstancestocross.Theproteinfacilitates(helps)thediffusionacrossthemembrane FacilitatedDiffusionandEnergy Occurswiththefollowing:1.Chargedmolecules(ions)2.When...
Types of Diffusion Diffusion across the cell membrane is eithersimpleorfacilitated. Simple diffusionFacilitated diffusion MechanismMolecules move directly across the membrane without the aid of a carrier proteinMovement occurs passively down a concentration gradient, however, the molecules require the help of...
Accumulation of N-Arachidonoylethanolamine (Anandamide) into Cerebellar Granule Cells Occurs via Facilitated Diffusion N-Arachidonoylethanolamine (anandamide, AEA) is a putative endogenous ligand of the cannabinoid receptor. Intact cerebellar granule neurons in primary cult... Cecilia,J.,Hillard,... -...
When DNA-binding proteins search for their specific binding site on a DNA molecule they alternate between linear 1-dimensional diffusion along the DNA molecule, mediated by nonspecific binding, and 3-dimensional volume excursion events between successive dissociation from and rebinding to DNA. If the...
Simple and facilitated diffusion occurs following a gradient and has a negative ΔG. When the flow of a substance is in the direction opposite to a gradient, the ΔG is positive and the flow can only take place if energy is supplied. This constitutes active transport. Coupling of an exergo...
1、Facilitateci Iliffusion and Active Transport Facilitated Diffusion Movement of specific molecules across cell membranes through protein cha nnelsI Each protein channel only allows a particular substances to crossThe protein facilitates (helps) the diffusion across the membraneOccurs with the followi 2...
Glucose uptake oc- curs by facilitated diffusion in procyclic forms of Try- panosoma brucei. Eur J Biochem 1996;236:228 - 33.Wille U, Seyfang A, Duszenko M (1996) Glucose uptake occurs by facilitated diffusion in pro- cyclic forms of Trypanosoma brucei . Eur J Biochem 236:228–233...