The adipocytes, animal fat storage, generate ATP, insulate, and may generate heat. Fats can be made into soap by saponification, these then emullisfy grease. Glycerophospholipids have a class called sphingosine. Cholestrol, a steroid, is in a bulky chair that disrupts membrane flow. Fluid Mosaic is a membrane model with a fluid mix of lipids and proteins.
Latteral diffusion is movement parallel to the membrane surface.
Temperature affects this movement, however I'm still unclear of the details after reading this section. A protein skeleton helps maintain the shape of the cell. Cells don't equalize concentrations if the molecule is bound by macromolecule, maintain electrical potential, or a thermodynamically favored process is coupled with it. Passive transport, diffusion, depends on the diffusion coefficient, partition coefficient of membrane, and the permeability coefficient. Facilitated transport, by protein pores, however bacteria can make ionophores holes which allow ions to free flow, destroying balance.