Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

Exercise 3

Heterotrimeric and Monomeric G Proteins. G protein-linked receptors interact with heterotrimeric G proteins to activate them.
(a)Upon binding to the receptor, the G y subunit catalyzes GDP/GTP exchange by the G subunit. How is this similar to the activation of Ras by a receptor tyrosine kinase
(b)What similarities are there at the molecular level between how cells regulate the rate of GTP hydrolysis by the catalytically active portion of a heterotrimeric G protein and by Ras