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Which structure represents a phosphorylated subunit of glycogen as described in the passage?

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The structure that represents a phosphorylated subunit of glycogen as described in the passage is D.
The increased calcium availability binds to the calmodulin subunit and activates glycogen phosphorylase kinase. AMP activates glycogen phosphorylase b by changing its conformation from a tense to a relaxed form. This relaxed form has similar enzymatic properties as the phosphorylated enzyme.
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