7. Energy and Metabolism
Enzyme Activation Energy
Multiple Choice
Multiple ChoiceA plot of reaction rate (velocity) against temperature for an enzyme indicates little activity at 10°C and 45°C, with peak activity at 35°C. The most reasonable explanation for the low velocity at 10°C is that __________.
A
the hydrogen bonds that define the structure of the enzyme's active site are unstable
B
the substrate becomes a competitive inhibitor at lower temperature
C
the enzyme was denatured
D
the cofactors required by the enzyme system lack the thermal energy required to activate the enzyme
E
there is too little activation energy available
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