Osmosis is the result of diffusion across a semipermeable membrane. If two solutions of different concentration are separated by a semipermeable membrane, then the solvent will tend to diffuse across the membrane from the less concentrated to the more concentrated solution. More How Are Diffusion Osmosis And Active Transport Similarities videos. Admit Card Of Pstet 2011.

Best Answer: OK, first of all diffusion is a bit ambiguous as there is passive diffusion and facilitated diffusion. All three forms of transport ( two forms of diffusion and active transport) involve moving a molecule across a biological membrane. Similarities passive diffusion & faciltated diffusion: Faciltated diffusion involves and requires a protein transporter to allow the otherwise very impermeant molecule while the passive diffusion does not. Energy for both forms of diffusion comes from molecule 'flowing down its concentration gradient', i.e. Flowing from high to low concentration only. In other words, no additional external energy is required for diffusion Similarities between 'active transport' vs 'faciltated diffusion': both use a protein carrier or transporter to move an otherwise impermeant substrance across a permeability barrior such as a biological membrane.

Difference between 'active transport' vs either form of diffusion: is active transport can transport an impermeant molecule or ion against its concentration gradient while faciltated diffusion can not. Editar Opciones De Arranque De Windows Para Microsoft Windows Vista. Active transport but not diffusion (either flavor) required external chemical energy to be supplied, often in the form of high-energy bonds in ATP. Examples of passive- and faciltated-diffusion and active transport: Gases such as oxygen and CO2 moves across membranes by passive diffusion.

Molecules such as glucose and amino acids moves across membranes by facilitated diffusion. Na+ and K+ ions are pumped by active transport out of and into cells, respectively, generating a concentration gradient with Na+ high outside and K+ high inside of animal cells. Facilitated diffusion is often referred to as carrier, channel or transporter-mediated transport. Active transport is mediated by proteins referred to as pumps, such as the plasma membrane Na/K pump, etc. Active transport is when you use energy to move substances from an area of low concentration to an area of high concentration, the substances are transported across the cell membrane using transport proteins or transport channel proteins. Diffusion is the passive movement of substances from an area of high concentration to an area of low concentration, this is also facilitated by transpot proteins or transport channel proteins.

Transport channel proteins work in a kissing gate type system, one end opens and the other closes, then the first end closes and the second end opens, transport proteins can also flip over. The difference between transport channel proteins and transport proteins is that transport proteins transport one molecule at a time, whereas transport channel proteins transport many molecules at once. • Tell us some more • Upload in progress • Upload failed. Please upload a file larger than 100 x 100 pixels • We are experiencing some problems, please try again.