Carbohydrate
When living organisms are cooled below some critical body temperature, the metabolic reactions within their cells cease to function properly. This malfunction occurs because

there is insufficient molecular motion for substrates to interact
their enzymes lose the proper three-dimensional shape
enzyme active sites become permanently bound to substrates
the activation energy for the reaction is raised

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Carbohydrate
Which of the following statements about the energy needs of cells is false?

Without a continuous input of energy, cell disorder will increase
The laws of thermodynamics force cells to acquire energy
Many cellular reactions have an associated activation energy
The most usable energy for cells comes from the rapid combustion of glucose

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