Question 2 2 points Save Answer A certain effector protein can be activated by p

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Question 2 2 points Save Answer A certain effector protein can be activated by phosphorylation at a key tyrosine residue. An upstream kinase rapidly phosphorylates this tyrosine in the presence of a signal. However, the kinase also phosphorylates and activates a slow-acting phosphatase that can dephosphorylate the phosphotyrosine. Which curve in the following graph would you expect to represent the activity of the effector molecule over time? The input signal is present during the period indicated in gray. The dashed line represents the response in the absence of the phosphatase. 100 0.01 Time OA. D OB.A OC.B OD.E

Explanation / Answer

Ans. The correct option would be the B pathway. As the phosphorylation of the tyrosine residue undergoes there would be change in the signalling pathway. The A pathway takes place when there is abscence of phosphorylation as it follows the dotted line.  

The effector molecule gets rapidly activated due to the phosphorylation by the tyrosine residue which means the time required for signalling would be reduced which is evident from the pathway followed by path B.

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