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.
Techopedia explains Universal Serial Bus (USB) A Universal Serial Bus (USB) is basically a newer port that is used as a common interface to connect several different types of devices such as keyboards, printers, media devices, cameras, scanners, and mice. It is designed for easy installation, faster transfer rates, higher quality cabling and hot swapping.