Final answer:
In glycogen and amylopectin, the branch points feature α-1,6-glycosidic linkages. These linkages are distinct from the main chain's α-1,4-glycosidic bonds and result in the branched structure of these polysaccharides.
Step-by-step explanation:
The branch points in both glycogen and amylopectin are characterized by α-1,6-glycosidic linkages. While both polysaccharides have their main chains linked by the α-1,4-glycosidic bonds, it is the α-1,6-glycosidic linkage that is responsible for creating the branching structure seen in these storage carbohydrates. Glycogen, which is the animal storage form of glucose, has these branch points occur even more frequently than amylopectin, the plant counterpart. Therefore, the linkage you would expect to find at a branch point in glycogen or amylopectin is the α-1,6-glycosidic linkage.