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.
Third Reich: Meaning third regime or empire, the Nazi designation of Germany and its regime from 1933-45. Historically, the First Reich was the medieval Holy Roman Empire, which lasted until 1806.The Second Reich included the German Empire from 1871-1918.eaning third regime or empire, the Nazi designation of Germany and its regime from 1933-45. Historically, the First Reich was the medieval Holy Roman Empire, which lasted until 1806.