Pan-African flag - History. 1  The flag was created in 1920 by members of UNIA in response to the enormously popular 1900 coon song Every Race Has a Flag but the Coon. [4] which has been cited as one of the three songs that firmly established the term coon in the American vocabulary.
Whether a hormone binds to a receptor inside or outside a cell depends on the chemical nature of the hormone and its compatibility with the cellâs fatty outer membrane. The membraneâs fat layers impede water-friendly hormones from passing through but allow fat-derived hormones to readily enter the cell.
Each cell typically has many receptors, of many different kinds. Simply put, a receptor functions as a keyhole that opens a neural path when the proper ligand is inserted. Ligand binding stabilizes a certain receptor conformation (the three-dimensional shape of the receptor protein, with no change in sequence).