In enzymes, some of these amino acids form a site in the structure that catalyzes the enzymatic reaction. This site, called the active site of the enzyme, has amino acids that bind specifically to the substrate molecule, also called a ligand (Fig. 2). In a similar manner, certain sites in cell receptor proteins bind to specific ligand molecules that the receptor recognizes.
When did France's second empire end? The Second Empire ended with the swift and catastrophic defeat of  France in the Franco-Prussian war of 1870. The war was engineered  by Bismarck with the idea that Germany â¦would be united.This  included the capture by the Prussians of the Napoleon III. Then the  proclamation at Versailles of the German Empire, the loss to France  of Alsace and Lorraine, and the proclamation of the Third Republic.
The revolution of 1848 meant the end of king Louis Philippe's rule. The Second Republic was declared, and its Constitution gave much power to a directly elected President. Whe â¦ n the election for the Presidency was held in late 1848, Louis Napoleon put forward his candidacy and he went on to win the election, becoming the Republic's President. Kathleen Hughes Supervisor