Why are phosphorylation and dephosphorylation reactions commonly used to regulate signal transduction pathways?
A. Phosphate groups are efficient second messengers
B. Protein kinases and phosphatases are abundant in most cells
C. The hydrolysis of bound GTP generates GDP, which can change the activity of proteins bound to GDP
D. The addition or removal of a phosphate group can expose or hide potential binding sites in proteins or
change protein activity
D. The addition or removal of a phosphate group can expose or hide potential binding sites in proteins or
change protein activity
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Two weeks following a hiking trip in which several ticks were noticed and numerous mosquitoes were biting, a 25-year-old man notices a rash shaped like a red ring on the back of his thigh. He was not concerned because he had no other symptoms. Three months later he noticed significant pain in his elbows and his knees. What is the most likely cause of his illness?
A. Ehrlichiosis B. Rocky Mountain Spotted Fever C. West Nile encephalitis D. Lyme disease
The point at which this neuron will be able to
generate another action potential is indicated by a. A. b. B. c. C. d. D. e. E.
The knee is ________ to the foot.
Fill in the blank(s) with the appropriate word(s).
As the baby's body temperature rose, I became very concerned that the increase in heat energy would
A. cause the baby's proteins to denature. B. force me to place her in a lukewarm bath to help remove the excess heat energy in a slow, controlled fashion. C. require me to give a non-aspirin medication that would help control fever. D. All the choices are correct.