Congress is ; that is, it is divided into two separate chambers, the house of representatives

The answer is bicameral. The bicameral legislature is a process where the legislators are being divided into two or separate in a way of having two branches and to be differentiated from it to a unicameralism or the cameralism in the legislature.

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an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.