Describe the characteristics of a polar molecule?

Polar molecules are asymmetric, either containing lone pairs of electrons on a central atom or having atoms with different electronegativities bonded. ... A polar molecule is a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.