What is the role of the magnesium ion in kinases that require the magnesium-ATP complex to donate phosphoryl groups?
A) Maintain the configuration of the holoenzyme.
B) Shield the charged phosphate groups of ATP.
C) Produce an electrophilic attack on the substrate.
D) Promote ionization of bound water.
E) Produce ionization of the substrate to be phosphorylated.
Correct Answer:
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A)transferring a phosphate group
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A)donate one
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Q19: What structure is shown? 
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