Fig. 3

Transport of lactose as observed from the inside of the Prokaryo cell, within the cytoplasm. Sitting on the surface of the membrane, the inner half of the transmembrane proteins are depicted in red. Lactose molecules are shown as red and green spheres. In the centre, DNA is represented as a coiled structure. Note the exposed operon region on the DNA, where ribosomes, repressor and peptide chains are partly visible. This region is highlighted in Fig. 5