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Question
When living organisms are cooled below some critical body temperature, the metabolic reactions within their cells cease to function properly. This malfunction occurs because
Options:
A .  their enzymes lose the proper three-dimensional shape
B .  enzyme active sites become permanently bound to substrates
C .  the activation energy for the reaction is raised
D .  there is insufficient molecular motion for substrates to interact
Answer: Option D
Answer: (d).there is insufficient molecular motion for substrates to interact

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