he information below shows and describes the intermediate steps of the MAPK/ERK signaling cascade. After MEK is activated, it phosphorylates and activates ERK. ERK goes on to phosphorylate and activate a variety of target molecules, including transcription factors like c-Myc that promote cell growth and division.
Which of the following toxins will most likely inhibit the phosphorylation of c-Myc?
answer choices
A toxin that prevents the phosphorylation of ERK
A toxin that prevents the dephosphorylation activity of MEK
A toxin that prevents the removal of a phosphate group from ERK
A toxin that prevents c-Myc from activating ERK



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