I'm not sure it lends itself to such contrived examples. A more useful comparison would be the use of backbone to build an entire web app (a small one). Backbone has a number of components and it's not exactly like you can have a three-line diff of the two to explicate the merits of one of the other.
Check out the Backbone one and the jQuery one. They should basically be the same idea, suited to each of the two frameworks.
Also, remember that Backbone and jQuery are not mutually exclusive (quite the contrary -- Backbone actually requires jQuery/Zepto). So you're sort of comparing Tangerines and Oranges.
I'd look here: http://addyosmani.github.com/todomvc/
Check out the Backbone one and the jQuery one. They should basically be the same idea, suited to each of the two frameworks.
Also, remember that Backbone and jQuery are not mutually exclusive (quite the contrary -- Backbone actually requires jQuery/Zepto). So you're sort of comparing Tangerines and Oranges.