Wisconsin's winning drive was aided by two pass interference penalties. On third and 10 from the Northern Illinois 34, linebacker Larry Williams was called for interference after bumping running back Anthony Davis, giving Wisconsin (4-0) a first down at the 29.
After Bollinger found David Braun for a 15-yard completion, safety Justin Dole collided with Braun and was flagged for another interference penalty, resulting in a first and goal at the two.
Bollinger went up the middle on the next play, giving the Badgers a victory in a game in which they were outplayed.
Wisconsin was outgained, 455 yards to 275, and its running game was virtually non-existent as the Badgers managed just 68 yards. Davis was held to 49 yards on 14 carries.
Michael Turner, replacing Thomas Hammock, rushed for 160 yards and two touchdowns on 34 carries for the Huskies (1-2). He scored on runs of three and one yards in the fourth quarter as Northern Illinois rallied from an eight-point deficit to take a 21-17 lead with 5:55 remaining.
Hammock rushed for 176 yards in Northern Illinois' season-opening 42-41 victory over Wake Forest, but was kept out of last week's loss to South Florida due to a possible heart condition and is sidelined indefinitely.