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A GDP analog that can't be converted to GTP was added to a cell. The GDP analog otherwise behaves the same as authentic GDP.

34. A GDP analog that can't be converted to GTP was added to a cell. The GDP analog otherwise behaves the same as authentic GDP. When g-proteins bind to the GDP analog, they are inactive, just like when they bind authentic GDP.  This cell has authentic GDP and plenty of GTP as well. What impact would this GDP analog have on the phosphoinositide (IP3) and growth factor pathways if it were bound to the g-proteins? Pick the best available answer.



1) The g-proteins in both pathways would likely be readily activated when the appropriate receptors are bound by their respective ligands because the GDP analog behaves like authentic GDP (other than it cannot be used to make GTP).



2) The g-proteins in both pathways would NOT be readily activated when the appropriate receptors are bound by their respective ligands since GTP can't be made from the analog.



35. Which of the following best describes the complete titration curve of a compound with a strong base. The compound has 4 titratable groups with pKa values of 1.2, 4.7, 8.8, and 10.9. Assume the titration is starting with this compound in its fully protonated form.


1) The best part of waking up, is Folgers in your cup. 


2) Reading left to right, there will be four midpoints corresponding to the pH values of 10.9, 8.8, 4.7, and 1.2, respectively.



3) Reading left to right, there will be four midpoints corresponding to the pH values of 1.2, 4.7, 8.8, and 10.9, respectively.



4) Reading left to right, there will be four end points corresponding to the pH values of 10.9, 8.8, 4.7, and 1.2, respectively.




5) Reading left to right, there will be four end points corresponding to the pH values of 1.2, 4.7, 8.8, and 10.9, respectively.

Top Answer

Answer. A. 2. The g-proteins in both pathways would  NOT  be readily activated when the appropriate receptors are bound... View the full answer

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