The Chicago Bears on Friday morning announced former Raiders quarterback Jason Campbell will start Monday night against the 49ers.Campbell will be entrusted with his first start for the Bears with Jay Cutler ruled out of action after sustaining a concussion in Chicago's 13-6 loss to the Houston Texans on Sunday night.Cutler has thrown for 1,814 yards on 59.2-percent passing this season with 12 touchdowns and 10 interceptions. His passer rating is 80.4 Campbell has completed 12 of 20 attempts this season for 94 yards with no touchdowns and no interceptions.While with the Raiders in October 2010, Campbell completed just 8 of 21 attempts for 83 yards with no touchdowns and two interceptions in a 49ers 17-9 victory at Candlestick Park. It was the 49ers first victory after five losses to open the season.Alex Smith, who exited the 49ers' game Sunday in the second quarter against the St. Louis Rams with a concussion, took part in limited practice Thursday and is expected to start Monday night.Smith ranks behind only Peyton Manning and Aaron Rodgers among NFL quarterbacks with a passer rating of 104.1. Smith is completing a league-best 70 percent of his pass attempts with 13 touchdowns and five interceptions. He also is third in the NFL with an 8.0-yard average per pass attempt. But the 49ers continue to be a ground-based offense. Smith ranks 31st in pass attempts. Prior to the 2011 season, Raiders beat reporter Paul Gutierrez and I had an email exchange in which we compared Smith and Campbell -- the then-starting quarterbacks of the Bay Area teams. Here was how we viewed those players before last season.