Scelta multipla
Which of the following statements about enzymes is/are true?
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3. Energy & Cell Processes
Enzymes
Scelta multipla
Which of the following statements correctly describe(s) the role or roles of heat in biological reactions?
A
Heat from the environment is necessary for substrates to get over the activation energy barrier.
B
The kinetic energy of the substrates is increased as the amount of heat in the system is increased.
C
Increasing the amount of heat in a system will always increase the rate of enzyme-catalyzed reactions.
D
The second and third choices are correct.
E
The first and second choices are correct.
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Understand the concept of activation energy: Activation energy is the minimum amount of energy required for a chemical reaction to occur. In biological systems, enzymes often lower the activation energy needed for reactions.
Evaluate the first statement: Heat from the environment can provide the energy needed for substrates to overcome the activation energy barrier, making it a correct statement.
Analyze the second statement: Increasing heat in a system raises the kinetic energy of substrates, which can lead to more frequent and energetic collisions between molecules, supporting the second statement.
Consider the third statement: While heat can increase reaction rates, enzyme-catalyzed reactions have an optimal temperature range. Excessive heat can denature enzymes, reducing their effectiveness, making this statement incorrect.
Conclude with the correct answer: Based on the analysis, the first and second choices are correct, as they accurately describe the role of heat in biological reactions.
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