Final answer:
Sucrose is a disaccharide consisting of glucose and fructose, and it is absorbed directly into the bloodstream during digestion. The catabolism of fructose and galactose produces the same number of ATP molecules as glucose.
Step-by-step explanation:
Sucrose is a disaccharide with a molecule of glucose and a molecule of fructose bonded together with a glycosidic linkage. Fructose is one of the three dietary monosaccharides, along with glucose and galactose (which is part of the milk sugar, the disaccharide lactose), which are absorbed directly into the bloodstream during digestion. The catabolism of both fructose and galactose produces the same number of ATP molecules as glucose.