NURSING EXAM QUESTIONS
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It raises the activation energy of the reaction, decreasing the reaction rate
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It lowers the activation energy of the reaction, decreasing the reaction rate
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It lowers the activation energy of the reaction, increasing the reaction rate
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It raises the activation energy of the reaction, increasing the reaction rate
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Detailed explanation-1: -Enzymes (and other catalysts) act by reducing the activation energy, thereby increasing the rate of reaction. The increased rate is the same in both the forward and reverse directions, since both must pass through the same transition state.
Detailed explanation-2: -Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy.
Detailed explanation-3: -Enzymes perform the critical task of lowering a reaction’s activation energy-that is, the amount of energy that must be put in for the reaction to begin. Enzymes work by binding to reactant molecules and holding them in such a way that the chemical bond-breaking and bond-forming processes take place more readily.
Detailed explanation-4: -Enzymes lower the activation energy necessary to transform a reactant into a product. On the left is a reaction that is not catalyzed by an enzyme (red), and on the right is one that is (green). In the enzyme-catalyzed reaction, an enzyme will bind to a reactant and facilitate its transformation into a product.
Detailed explanation-5: -In enzyme-catalyzed reactions, the enzymes lower the activation energy needed for a certain chemical reaction. The free energy of the reactants and products do not change, just the threshold energy level needed for the reaction to commence.