Every Sunday around this time, we'll recap five lessons from the week that was in Big Ten football.

Pencils ready? Class is in session ...

1. Big Ten quarterback mysteries partially solved: Week 1 provided some clues about the Big Ten's cloudy quarterback picture, but a few mysteries remain. True freshman Christian Hackenberg looks like the long-term answer at Penn State. Although he had a few shaky moments, Hackenberg completed 22 of 31 passes for 278 yards and showcased a big-time arm on a 54-yard touchdown strike to Eugene Lewis early in the fourth quarter of the Lions' win against Syracuse. Joel Stave got the start for Wisconsin and re-established himself with a mostly solid performance against Massachusetts, twice finding top receiver Jared Abbrederis for touchdowns. Jake Rudock's collegiate debut ended with a costly interception, but the Iowa sophomore showed some positive signs against Northern Illinois, passing for 256 yards. Iowa has something to build on with Rudock. Indiana might lack a definitive starter, but the Hoosiers have multiple options with Tre Roberson, Nate Sudfeld and Cam Coffman. Sudfeld, who played most of the opener and fired four touchdown passes, may end up being the answer for IU. Things are much shaker for Michigan State and Purdue, as both teams struggled at the quarterback spot in their openers. The Spartans likely will continue to play multiple signal-callers, while Rob Henry's starting spot at Purdue could be in jeopardy if he doesn't take better care of the ball.

2. Michigan, Illinois and Iowa can see clearly now on offense: After two years of running the Denard offense, Michigan displayed a system more suited to coordinator Al Borges' long-term vision. The result was a 59-point, 463-yard explosion against Central Michigan, in which just about everybody contributed. Michigan's vertical passing game is much more of a factor with Devin Gardner at quarterback, and the Wolverines ran the ball well with multiple backs. Illinois and Iowa lived in the dark on offense for much of the 2012 season, finishing 119th and 114th, respectively, in yards per game. Both the Fighting Illini and Hawkeyes looked more comfortable with their offensive identities in the openers. Illinois senior quarterback Nathan Scheelhaase threw for 340 first-half yards en route to a career-high 416 against Southern Illinois. Despite a crunch-time interception, Iowa's Rudock played with better rhythm in his first career start than veteran James Vandenberg did all of last season. The Hawkeyes are far from a juggernaut but eclipsed 300 yards in the first half against Northern Illinois and scored two touchdowns, more than they had in the first two games of last season. Now if only Greg Davis would get rid of the bubble screen ...

3. Michigan State, Nebraska haven't fixed their issues: First, the good news: We've only played one week, and Michigan State and Nebraska are each 1-0. The Spartan Dawgs defense is as good as advertised, perhaps even a little bit better, while the Nebraska offense remains explosive. Now, the bad news: The problems that plagued both teams last season and were supposedly addressed in the offseason remain glaring, neon-blinking red flags. The Spartans' offense struggled up front against an inferior opponent in Western Michigan, couldn't create separation at wide receiver and never consistently moved the football. Quarterbacks Andrew Maxwell and Connor Cook combined to complete 17 passes for 116 yards, continuing a troubling trend of a condensed passing game. Although Jeremy Langford (94 rush yards) was a bright spot at times, he also fumbled in the red zone. Michigan State can't expect to win more games by having its defense outscore its offense. The opposite is true at Nebraska, which rebuilt its defense in the offseason with supposedly more athletic players. We totally expected the new Blackshirts to need a few games to find their sea legs, but we did not foresee Wyoming putting up 602 yards of offense and nearly winning in Memorial Stadium. That's reminiscent of the Huskers' defensive disasters last season, only worse because it came at home against a mediocre WAC team. Right now, the same songs are playing in East Lansing and Lincoln, and someone better change the channel.

4. Ohio State can't lose focus despite weak schedule: Let's face it: Ohio State shouldn't have too much to worry about until Wisconsin comes to The Shoe on Sept. 28. But the Buckeyes are far from a perfect team, and they need to use each week as an opportunity to develop, especially on defense. Ohio State built a 23-0 lead against Buffalo in less than a quarter Saturday, but the concentration level seemed to waver a bit from then on. The Bulls began moving the ball, Braxton Miller threw a pick-six and there was a decent amount of sloppiness in the middle of the game. Ohio State might have had a perfect record in 2012, but it was far from a perfect team and remains that way now. Turnovers and penalties -- the Buckeyes had nine of them -- will get you beat against better competition. Ohio State would benefit from a true test during nonleague play, but unless San Diego State or Cal surprisingly provides one, it won't come until the Big Ten opener against the Badgers. Urban Meyer and his staff must stress the details in all three phases the next few weeks. Talent isn't the issue for Ohio State, but a lack of focus could prove costly down the road.

5. Honeymoon is over for Hazell, continues for Andersen: Purdue was a solid underdog on the road at Cincinnati, but few expected the nightmarish result that occurred. Down just 14-7 at halftime, the Boilermakers imploded in an ugly 42-7 loss that was as bad as anything from the Danny Hope era. Purdue had four turnovers and was so inept that quarterback Rob Henry tweeted an apology to "all my family, teammates, friends and fans. My performance today was unacceptable. Never played that bad in my life." The schedule provides a break next week with Indiana State, but then the Boilers have six straight tough games. First-year coach Darrell Hazell has a lot of work to do to keep the offseason optimism going. There's no such problem yet for Wisconsin coach Gary Andersen. It seemed like not much had changed in Madison as the Badgers beat UMass 45-0 and rushed for 393 yards. Of course, Andersen had a much easier opponent for his debut and gets Tennessee Tech next week. His first real challenge will come in Week 3 at Arizona State. But Wisconsin clearly is in a lot better shape than Purdue right now.