Discussion
Protein kinases act by
Answer: D
Correct answer: adding phosphate groups to target proteins
A kinase transfers a phosphate from ATP onto a serine, threonine or tyrosine residue of a target protein, changing its shape and so its activity. Phosphatases remove those phosphates, and the balance between the two is what makes phosphorylation a reversible switch rather than a permanent modification - which is exactly what a signalling pathway needs.
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