Figure Q16-63 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?
(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:
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