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

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Carbohydrate
Which of the following does not occur during gluconeogenesis?

The decarboxylation of oxaloacetate to phosphoenolpyruvate
The carboxylation of pyruvate to oxaloacetate
The conversion of PEP to fructose bisphosphate
The conversion of pyruvate to phosphoenolpyruvate (PEP)

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Carbohydrate
The multistep pathways of metabolism are efficient because they

locate all of the enzymes for a pathway in the same place within the cell
use the same enzyme for all of the substrates in the pathway
spread the enzymes for a pathway into several different organelles
use the same substrate for all of the enzymes in the pathway

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