Multiple Choice
Which enzyme is responsible for covalently joining DNA fragments with sticky ends that have already hydrogen bonded to each other?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following best describes the primary role of enzymes in chemical reactions?
A
They increase the equilibrium constant of the reaction.
B
They change the overall free energy (9G) of the reaction.
C
They are consumed during the reaction and become part of the products.
D
They lower the activation energy required for the reaction to proceed.
Verified step by step guidance1
Understand the role of enzymes in biochemical reactions: Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process.
Clarify the concept of activation energy: Activation energy is the minimum energy required for reactants to reach the transition state and form products. Enzymes lower this energy barrier, making reactions proceed faster.
Eliminate incorrect options: Enzymes do not change the equilibrium constant of a reaction because they do not alter the ratio of products to reactants at equilibrium. Similarly, enzymes do not change the overall free energy (ΔG) of the reaction, as this is determined by the nature of the reactants and products.
Address the misconception about enzyme consumption: Enzymes are not consumed during the reaction; they remain unchanged and can be reused for subsequent reactions.
Conclude with the correct answer: The primary role of enzymes is to lower the activation energy required for the reaction to proceed, thereby increasing the reaction rate without altering equilibrium or free energy.
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