breakdown - destruction of the monomer or clip the linkages?
Here ya go:
“When fructose is consumed in the form of sucrose, it is digested (broken down) and then absorbed as free fructose. As sucrose comes into contact with the membrane of the small intestine, the enzyme sucrase catalyzes the cleavage of sucrose to yield one glucose unit and one fructose unit, which are then each absorbed.”
http://en.wikipedia.org/wiki/Fructose