All Washington cities. Washington: Portal to the Pacific Northwest. Washington State, positioned in the upper left corner of the map, offers an abundance of recreational, educational, cultural, and career opportunities. The state's largest city, Seattle, is a harbor town situated on Puget Sound, and is a popular choice for relocation.
Enzymes speed up the rate of chemical reactions by lowering the energy of activation (the amount of energy needed to begin a reaction).nzymes speed up the rate of chemical reactions by lowering the energy of activation (the amount of energy needed to begin a reaction).
Substances in plants and animals that speed biochemical reactions are called enzymes. Enzymes can build up or break down other molecules. The molecules they act on are called substrates. Enzymes are catalystschemicals that hasten a chemical reaction without undergoing any change themselves. Most enzymes are huge protein molecules (see Protein).