jquery "actions" are triggered by:
$.
jQuery.
$().
those periods (".") indicate properties, attributes or methods belonging to the jquery object.
with some exceptions, if you grep or regex your .js files, you'll see the jquery calls.
eg:
$.getJson()
jQuery.ajax();
$("document").ready();
or as
@aeric suggests, if you simply comment out the line referring to jquery in your html document
and try to render the document, you'll see which lines are dependent on jquery in your browser's
developer's tab. you will most likely see the error: "$ is not defined". (in java, it would be like
calling a class's method without having instantiated the class and having the compiler flag
unreferenced properties or methods).
once you've located the jquery references, you can easily check them out in jquery's documentation.