Carbohydrate
Which of the following is carried out when cAMP functions as a second messenger?

Activates the cAMP-dependent protein kinase
Activates all cytosolic protein kinases
Acts outside the cell to influence cellular processes
Acts second in importance to AMP

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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
there is insufficient molecular motion for substrates to interact
the activation energy for the reaction is raised
enzyme active sites become permanently bound to substrates

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