Multiple Choice
Which of the following statements about enzymes is false?
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6. Enzymes and Enzyme Kinetics
Optimal Enzyme Conditions
Multiple Choice
In the context of optimal enzyme conditions, which statement best describes how increasing temperature typically affects enzyme activity for a typical mammalian enzyme?
A
Activity increases as temperature rises up to an optimum, then decreases sharply at higher temperatures due to enzyme denaturation.
B
Activity is independent of temperature because enzymes lower activation energy equally at all temperatures.
C
Activity increases continuously with temperature with no upper limit because reaction rates always accelerate.
D
Activity decreases steadily as temperature rises because kinetic energy always disrupts enzyme-substrate binding.
Verified step by step guidance1
Understand that enzyme activity is influenced by temperature because temperature affects molecular motion and the stability of the enzyme's structure.
Recognize that as temperature increases, the kinetic energy of molecules increases, which generally leads to more frequent and effective collisions between enzyme and substrate, thus increasing enzyme activity.
Identify that there is an optimal temperature at which enzyme activity is at its maximum; for most mammalian enzymes, this is around 37°C (body temperature).
Know that beyond this optimal temperature, the enzyme's three-dimensional structure begins to destabilize, leading to denaturation, which causes a sharp decline in enzyme activity.
Conclude that the typical temperature-activity relationship for mammalian enzymes is an increase in activity up to an optimum temperature, followed by a rapid decrease due to denaturation.
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