Of the components of a heterotrimeric G protein,which subunit(s) is(are) able to activate downstream responses?
A) only the alpha subunit
B) only the beta/gamma subunits
C) only the delta subunit
D) both the alpha subunit and the beta/gamma subunits
Correct Answer:
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Q1: Phosphatidylinositol 4,5-bisphosphate (PIP₂)is cleaved by phospholipase C
Q2: Pull-down assays using proteins that ONLY bind
Q4: Cell sensitivity to an external signal is
Q5: Phospholipase C is activated by:
A)Gαs.
B)Gαᵢ.
C)Gαq.
D)none of the
Q6: Which of the following is NOT a
Q7: In trimeric G proteins,GTP binds to:
A)the α
Q8: In paracrine signaling,the signaling molecule:
A)acts on cells
Q9: A particular antagonist for an epinephrine-receptor protein
Q10: Pull-down assays can be used to detect
Q11: 1,2-diacylglycerol (DAG)and inositol 1,4,5-trisphosphate (IP3)are cleaved from
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