NURSING EXAM QUESTIONS
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which best describes how an enzyme affects the rate of a chemicalreaction?
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It increases the temperature of the reaction.
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It lowers the activation energy of the reaction.
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It changes the products created in the reaction.
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It causes the reaction to proceed in an unfavorable direction.
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Explanation:
Detailed explanation-1: -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.
Detailed explanation-2: -Enzymes (and other catalysts) act by reducing the activation energy, thereby increasing the rate of reaction.
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.
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