Using the diagram below, label the polar "head" groups and the nonpolar "tails" and indicate whether they are hydro -philic or -phobic a) Simple diffusion is defined as the movement of substances from an area of [HIGH / LOW] concentration to an area of [HIGH / LOW] concentration. Substances are said to go [WITH / AGAINST] the gradient. b) Give an example of ONE/1 substance that moves into/out of a cell via simple diffusion.

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Micelles and Biological Membrane

Micelles are the type of lipid molecules that organize themselves in spherical shape in aqueous solutions. The production of the micelle is a reply to the amphipathic behavior of fatty acids. It means that they consist of both hydrophobic regions and hydrophilic regions. In micelles, polar head groups (hydrophilic groups) produce an outer layer associated with water whereas nonpolar tails (hydrophobic groups) are organized in the interior.