Carbohydrate
Metabolic reactions that break down complex molecules into smaller compounds, thereby releasing usable energy for the cell, are best described as

photosynthetic
catalytic
catabolic
biosynthetic

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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

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

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