Carbohydrate
The conversion of pyruvate to oxaloacetate

occurs in the mitochondria
involves the fixation of carbon dioxide
all of the above
requires biotin

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Carbohydrate
Insulin

stimulates gluconeogenesis and glycolysis
stimulates gluconeogenesis and inhibits glycolysis
inhibits gluconeogenesis and stimulates glycolysis
inhibits gluconeogenesis and glycolysis

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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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