What is the correct range of measurements for the width of the cell surface membrane?

4.1.1 describe the fluid mosaic model of membrane structure with reference to the hydrophobic and hydrophilic interactions that account for the formation of the phospholipid bilayer and the arrangement of proteins

4.1.2 describe the arrangement of cholesterol, glycolipids and glycoproteins in cell surface membranes

4.1.3 describe the roles of phospholipids, cholesterol, glycolipids, proteins and glycoproteins in cell surface membranes, with reference to stability, fluidity, permeability, transport (carrier proteins and channel proteins), cell signalling (cell surface receptors) and cell recognition (cell surface antigens – see 11.1.2)

4.1.4.1 secretion of specific chemicals (ligands) from cells

4.1.4.2 transport of ligands to target cells

4.1.4.3 binding of ligands to cell surface receptors on target cells