Pitch: the use of notes in voice range. Speak in a voice range that is comfortable and move up or down Pause: Give you time to catch your breath and the audience time to collect your ideas. Articulation and Pronunciation: Articulation is the art of expressing words distinctly. Pronunciation is the ability to say words correctly. Length: Length of your presentation is crucial.
Enzyme. Photo by: fotohunter. An enzyme is a biological catalyst. A catalyst is a chemical compound that speeds up the rate of some chemical reaction. When that chemical reaction occurs in a living organism, the catalyst is known as an enzyme.hemical reaction: Any change in which at least one new substance is formed. Lock-and-key model: One of the ways in which enzymes bring about chemical reactions. Product: A compound that is formed as the result of a chemical reaction.
Split and merge into it. Answer by Sephy. Confidence votes 614. Because it lowers the activation energy of a reaction and allows the reaction to occur faster. An enzyme is a biological catalyst instead of a synthetic one.plit and merge into it. Answer by Sephy. Confidence votes 614. Because it lowers the activation energy of a reaction and allows the reaction to occur faster. An enzyme is a biological catalyst instead of a synthetic one.