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b. The shape of lactase does not change during the reaction c. Lactase is converted to glucose and galactose by the reaction d. One lactase enzyme can catalyze many reactions 6. Look up and write in the following definitions as they apply to chemical reactions: a. Catabolic b. Anabolic c. Endergonic d. Exergonic 7. An enzyme-catalyzed reaction was carried out with the substrate concentration initially a thousand times greater than the Km for that substrate. The activation energy for the catalyzed reaction is the same as for the uncatalyzed reaction, but the equilibrium constant is more favorable in the...(a; 12 points) Listed below are three enzymes from the glycolysis pathway. For any two (your choice) of these enzymes, draw the complete structure (including all H atoms) of the reactants and products for the reaction catalyzed by that enzyme, and write the names of the reactants and products. You must draw The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind. This is termed "induced fit", meaning that the precise orientation of the enzyme required for catalytic activity can be induced by the binding of the substrate. Oct 17, 2012 · option ii – Simple laboratory experiments show that when the enzyme lactase is mixed with lactose, the initial rate of reaction is highest at 48°C. In food processing, lactase is used at a much lower temperature, often at 5°C. Suggest reasons for using lactase at relatively low temperatures. (2 marks) Outline how enzymes catalyze reactions. The reaction rate does not increase if a greater quantity of alcohol is consumed over the same period of time because the reaction rate is determined only by the amount of enzyme present in the liver.Contrary to popular belief, the caffeine in coffee is ineffective at catalyzing the oxidation of ethanol.Lactase catalyzes the hydrolysis of lactose(usually called the substrate) to glucose and galactose, as seen in Eqn 1. Eqn 1 To keep our kinetic study as simple as possible, we will use the synthetic substrate, o-nitrophenyl--D- galactopyranoside (ONPG), in place of lactose. Hydrolysis: A chemical reaction in which the interaction of a compound with water results in the decomposition of that compound. 2. Know the substrate, enzyme, and end product of the reaction: Mar 21, 2011 · Invertase (EC 184.108.40.206 ) is an enzyme that catalyzes the hydrolysis of sucrose into fructose and glucose. Sucrose is a non-reducing sugar and gives a negative reaction with Benedict's. The reaction can be followed by looking at the production of reducing sugars as invertase produces glucose and fructose. Chemical formula for sucrose. Sucrose or common table sugar is a sweet white crystalline solid often used as a food additive. The chemical formula for sucrose is C 12 H 22 O 11 and its molar mass is 342.30 g/mol.