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Question 1 2 pts Phosphodiesterase hydrolyzes CGMP, which causes Ca++/Na+ channels to Question 2 2 pts ces All of the followi
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Answer: Phosphodiesterase is an enzyme that breaks the phosphodiester bonds in the cGMP and cAMP secondary messenger molecules. In dark cGMP binds to Cyclic nucleotide-gated channels, Ca++/Na+ channels and allow the flow of Ca++ and Na+ ions in to the cell. In light, Phosphodiesterase get activated in the photoreceptor cells and hydrolyze  cGMP leading to closer of Ca++/Na+ channels Hence, Phosphodiesterase hydrolyze the cGMP, which causes Ca++/Na+ channels to close.

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