Steroid hormones pass through the cell membrane and bind to a specific steroid hormone receptor protein. The combined steroid and receptor protein then bind to a specifiâ¦c sequence of bases in the DNA molecule. This sequence of bases is part of the promotor of a gene.   Binding of the steroid - receptor complex either activates (switches on) or represses (switches off) the gene which is controlled by that promotor.
A port replicator is an attachment for a notebook computer that allows a number of devices such as a printer, large monitor, and keyboard to be simultaneously connected.
Each of the devices is attached to the port replicator and when the notebook user wants access to one or more of the devices, the user simply attaches the port replicator rather than having to connect one device at a time. The port replicator duplicates each of the notebook's port , including parallel and serial ports. In addition, it may provide some extra ports for devices such as joysticks or Musical Instrument Digital Interface ( MIDI ) devices. A port replicator is similar to a docking station , but does not include expansion slot .