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Predicate? Many colas and most coffee contains the chemical caffeine that acts on an enzyme called "protein kinase A" by inhibition of the enzyme "CAMP phosphodiesterase" that usually lowers the concentration of cyclic AMP, the activator of protein kinase A. When caffeine inhibits phosphodiesterase, CAMP levels rise activating protein kinase A. Protein kinase A shifts the equation between blood glucose and glycogen by phopphorylating glucose synthase kinase, resulting in higher blood glucose levels and increased energy as well as increased anxiety. Coka cola contains about 1/4th as much caffeine as coffee.:

1) cAMP---->generated from adenyl cyclase + ATP) is broken down by phosphodiesterase (PDE)

2) PDE inhibited by caffiene.

3) PDE inhibition cause more available cAMP---->increases PKA

4) Increased PKA ---> inhibits glycogen synthase (which synthesizes glyciogen from glucose)----> thus increasing blood glucose----> leading to energy and jitters.

Unless you seek the predicate of this sentence which is cola and caffeine than they as there are 2 sentences in this question, both flawed

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