Interior Biological Membrane. The outer boundary is the plasma membrane and the compartments enclosed by internal membranes are called organelles. The main components of biological membranes are proteins lipids and carbohydrates in variable proportions.
Internal membranes define a variety of cell organelles Allows for passage of vital materials inout of cell Defines the difference gradients between ECFICF etc etc. Lipid components of the membrane determine the permeability of the membrane itself. Furthermore many life processes are mediated by membrane-bound proteins.
Interior -Endoplasmic reticulum keep products separate from cell interiorallows ribosomes to attach in RER.
BIOLOGICAL MEMBRANES Structure Function. Porasso RD1 Bennett WF Oliveira-Costa SD López Cascales JJ. Biological membranes are made of phospholipids that have assembled with the polar heads facing out to interact with the water and the non-polar tails. The biological membrane forms a cell and separates the interior of the cell from the external environment by means of a semi-permeable membrane.