Seventeenth-ranked Iowa prepares for Michigan State this week after a come-from-behind victory over Purdue. Iowa Coach Kirk Ferentz says it wasn’t pretty, but it was a win. He says there were several negatives that actually ended up being positive lessons for the team.Iowa’s beleaguered secondary let Purdue get back into the ballgame, but Ferentz says it wasn’t from lack of effort. He says they’re struggling and teams are throwing a lot to try and take advantage. Ferentz says they continue to work hard and he likes the spirit of the defense.Ferentz says Michigan State is a very dangerous team that has their entire offensive line back, a top quarterback and top receiver.Ferentz says the Spartans were one of the teams picked to challenge for the Big Ten title. He says their aggressive defense leads the way. He says their defense is more complex than Purdue’s and can give them a lot of trouble.Iowa comes into the game at 5-1 overall and 2-0 in the conference, while Michigan State is 3-2 and 1-0 in the conference.