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The Protein SOS Is a Guanine Nucleotide Exchange Factor for Ras.SOS

Question 32

Multiple Choice

The protein SOS is a guanine nucleotide exchange factor for Ras.SOS helps facilitate the exchange of GDP for GTP.What would be the effect of a mutation that inhibits the interaction between SOS and Ras?


A) GTP would remain bound to Ras,thereby disrupting downstream signaling events.
B) GDP would remain bound to Ras,thereby disrupting downstream signaling events.
C) GTP would remain bound to Ras,leading to overstimulation of the Ras pathway.
D) GDP would remain bound to Ras,leading to overstimulation of the Ras pathway.

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