Multiple Choice
Which enzyme is primarily responsible for the chemical breakdown of carbohydrates during digestion?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Which of the following best describes the primary ability of enzymes in biological systems?
A
They increase the equilibrium constant of reactions.
B
They permanently alter the products of reactions.
C
They provide energy for endergonic reactions.
D
They lower the activation energy of chemical reactions.
Verified step by step guidance1
Understand the role of enzymes in biological systems: 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 a chemical reaction to proceed. Enzymes lower this energy barrier, making reactions occur more easily and quickly.
Eliminate incorrect options: Enzymes do not increase the equilibrium constant of reactions, as equilibrium is determined by the thermodynamics of the reaction, not the catalyst. They also do not permanently alter the products of reactions, nor do they provide energy for endergonic reactions.
Focus on the correct answer: The primary ability of enzymes is to lower the activation energy of chemical reactions, allowing them to proceed at a faster rate under physiological conditions.
Summarize the importance of enzymes: By lowering activation energy, enzymes enable biological systems to carry out complex reactions efficiently, which is essential for maintaining life processes.
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