At 1202 mountain time, a Cessna 172 encountered jet blast from a Boeing 737 at Tucson International Airport and suffered wing and propeller damage. The flight instructor and student pilot were not injured. The Cessna had landed on runway 11R and was taxiing to the ramp. A United 737 was holding short for takeoff on runway 11L as the Cessna taxied behind it. The flight instructor reported that he was discussing jet blast awareness with his student as they were passing the jet. They taxied as far to the right side of the taxiway as they could. As the Cessna began to move back toward the middle of the taxiway, the left wing rose into the air and the right wing hit the ground two times and the propeller struck the pavement.