Multiple Choice
Which biological catalyst lowers the activation energy of a reaction?
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7. Energy and Metabolism
Enzymes
Multiple Choice
What is the primary role of enzymes in chemical reactions within the human body?
A
They lower the activation energy required for reactions to occur.
B
They provide energy for the reactions to take place.
C
They increase the temperature of the cell to speed up reactions.
D
They are consumed and permanently altered during reactions.
Verified step by step guidance1
Understand the role of enzymes: Enzymes are biological catalysts that speed up chemical reactions without being consumed or permanently altered in the process.
Clarify the concept of activation energy: Activation energy is the minimum amount of energy required for a chemical reaction to occur. Enzymes work by lowering this energy barrier, making reactions proceed more efficiently.
Eliminate incorrect options: Enzymes do not provide energy for reactions, nor do they increase the temperature of the cell. These are misconceptions about their function.
Highlight the correct mechanism: Enzymes achieve their function by stabilizing the transition state of a reaction, which reduces the activation energy required for the reaction to proceed.
Confirm the correct answer: The primary role of enzymes is to lower the activation energy required for reactions to occur, enabling biological processes to happen at a faster rate under normal physiological conditions.
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