Question 32
(Multiple Choice)
Figure 16-36 shows how normal signaling works with a Ras protein acting downstream of an RTK.You examine a cell line with a constitutively active Ras protein that is always signaling.Which of the following conditions will turn off signaling in this cell line? 
Figure 16-36
A)addition of a drug that prevents protein X from activating Ras
B)addition of a drug that increases the affinity of protein Y and Ras
C)addition of a drug that blocks protein Y from interacting with its target
D)addition of a drug that increases the activity of protein Y
Answer