Singer and Nicholoson model of plasma membranes is called fluid Mosaic model. According to this model lipid molecules are arranged in two lagers with their hydrophilic ends facing the periphery and hydrophilic ends facing the centre. The protein globules are dispersed in between the lipid layers. There are two types of proteins. The extrinsic proteins are found on the periphery and intrinsic proteins are present within the lipid bilayer. Chain of carbo-hydrates are found attached to lipids or proteins. This model is a chemical model that explains the arrangement of lipid, proteins and carbohydrates in plasma membrane.
