1.1. 3 Biomembranes control the flow of information between cells and their environment through specific receptors on the plasma membrane (signal transduction). 1. 1. 4 Eukaryotic cells have an extensive various compartments(forming differer ato internal membrane system dividing cells i organelles)1.1.3 Biomembranes control the flow of information between cells and their environment through specific receptors on the plasma membrane (signal transduction). 1.1.4 Eukaryotic cells have an extensive internal membrane system dividing cells into various compartments (forming different organelles)