单选题
The hormone glucagons(胰高血糖素) stimulates the breakdown of stored glycogen in liver and muscle cells by the following enzymes. Which is the first enzyme that must be activated? ( )
A、
Protein kinase A
B、
Phosphorylase kinase
C、
Glycogen phosphorylase
D、
Protein phosphatase
E、
Protein phosphatase inhibitor-1
【正确答案】
A
【答案解析】
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