Question

The question is from my oncology(cancer biology) class..I don't remember the exact question,but I think the question was..

"Explain in detail about3 pathways of ras"

My professor wants a very long,detailed explaination for each assignment... and I seriously haveno idea, and didn't even start studying the cell signalingpart.

I will really really appreciateit if you could explain in detail, including what is ras.. and etc,etc...