Answer
Shared properties of Ras and $G_{s}$;
Both bind either GDP or GTP; both are activated by GTP; both, when active, activate a downstream enzyme; both have intrinsic GTPase activity that shuts them off after a short period of activation.
Difference between Ras and $G_{s}$;
$Ras$ is a small, monomeric protein; $G_{s}$ is Hetrotrimeric.
Functional difference between $G_{s}$ and $G_{i}$;
$G_{s}$ activates adenylyl cyclase, $G_{i}$ inhibits it.
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