Scene at the Signing of the Constitution of the United States. The Constitutional Convention (also known as the Philadelphia Convention, the Federal Convention, or the Grand Convention at Philadelphia) took place from May 25 to September 17, 1787, in Philadelphia, Pennsylvania.
In living cells, WHAT serve as biological catalysts. Each acts on a specific substance called the enzyme's substrate and each catalyzes only one reaction. As catalysts, enzymes typically accelerate chemical reactions. The enzyme molecule has an active site, a region that will interact with a specific chemical substance.
Enzymes and Catalysis. Enzymes are proteins that reduce the energy required to achieve the transition state (Figure 2). Enzymes reduce the activation energy through a process called catalysis. A biochemical reaction when an enzyme is present is called a catalyzed reaction. Catalysis can happen in different ways. Enzymes can use the transfer of protons or electrons to the reactants to modify the state of the reactants.