AMES, Iowa — Nate Heise hit a go-ahead 3-pointer and Tamin Lipsey came up with an offensive rebound in the final seconds to cap No. 6 Iowa State’s rally in a 70-67 victory over Big 12 leader and second-ranked Houston on Monday night.Heise was 3 for 3 from 3-point range hours after sister Taylor Heise scored to help the U.S. Women’s Olympic hockey team beat Sweden 5-0 to reach the gold-medal game in Milan.The Cyclones (23-3, 10-3) closed with a 17-4 run to take down a second top-10 team in three days. Iowa State topped No. 8 Kansas 74-56 on Saturday.The Cougars (23-3, 11-2) had their six-game winning streak snapped and their conference lead was cut to a half-game over No. 4 Arizona heading into their matchup Saturday in Houston. Iowa State is third, a game behind Houston.Heise hit the 3-pointer from the left corner with 1:17 to play to give the Cyclones a 69-67 lead. Houston had two chances to tie or take the lead, but was called for a shot-clock violation with 43 seconds to play, then Chris Cenac Jr., missed a shot with four seconds left.Blake Buchanan was fouled after rebounding Cenac’s miss, but missed the front end of a one-and-one. Lipsey, though, got the offensive rebound, tap …