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 face the periphery and hydrophilic ends facing the centre. The protein globules are dispersed in there lipid layers. There are two types of proteins. The extrinsic proteins are found on the periphery arid intrinsic proteins are present within the lipid bilayer. Chain of carbohydrates are found attached to lipid or proteins. This model is a chemical model that explains the arrangement of lipids, proteins and carbohydrates in plasma membrane.
