Carbohydrate
Boat and chair conformations are found

in pyranose sugars
in any sugar without axial -OH groups
only in D-glucopyranose
in any sugar without equatorial -OH groups

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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

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

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Carbohydrate
Gluconeogenesis is the

formation of glycogen
breakdown of glycogen to glucose
breakdown of glucose to pyruvate
synthesis of glucose from non-carbohydrate precursors

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