In this case the molecule will act as a conductor. The LUMO is easily disturbed and when it is the molecule can switch from conductive to insulator ands back. This is the basis of a molecular transistor. Torsion, neighborhood electrostatic charge, ionization, and electron transport can all change the LUMO's localization. In fact, environmentally driven switching between insulator and conductor is the common characteristic of conductive molecules.
Molecular wires conduct electrons in one direction.
Molecular memories either change shape, binding, exhibit a charge shift or magnetic alignment under influence of an external field. Architectures for molecular systems will be driven by many requirements, but are expected to resemble SRAM based Programmable Logic Arrays such as FPGAs in some way. This is due to the large number of components necessary to assemble as well as our inability to handle molecules directly. Precise Construction - While it may not be strictly necessary it will be possible to construct precise molecular networks. This allows hetrogeneous cells to be mixed together in a known fashion.