Answer:
The two main reasons are nonpolar core of the bilayer and the active transport.
Explanation:
The membrane is structured to have two outer layers that are polar and an inner layer that is nonpolar.
If a membrane protein is exposed to the solvent, i<em>t will also have a polar side. It would be very difficult for the polar face of the membrane to move through the nonpolar core of the bilayer.</em> Therefore, this model is not feasible.
One major form of transport, active transport, moves solutes up the concentration gradient. <em>The binding of a solute and then release on another side of the membrane would only work for facilitated diffusion because it would cause a net movement of solutes down the concentration gradient.</em> It is unclear how energy could be expended to drive this process in the transverse carrier model.<em> Therefore, the transverse carrier model does not explain active transport.</em>
The ecosystem is an ecological system consisting of all of its biotic and abiotic factors
Yes - diffusion is a broad term that may be applied to a vast number of substances and is not limited to liquids ( gases can diffuse too). osmosis refers to the diffusion of liquid water down the water potential gradient
The ear has the tinest bones in the body. There are three bones in the ear. Hopes this helps you.
No the Calvin cycle is a light independent reaction that produces energy
