Final answer:
When 13 units of monosaccharides combine to form 6 units of oligosaccharide, 5 glycosidic linkages are formed between the monosaccharides.
Step-by-step explanation:
When 13 units of monosaccharides combine to give 6 units of oligosaccharide, the glycosidic linkages formed are between the anomeric carbon of one monosaccharide and the OH group of another monosaccharide.
Glycosidic linkages are carbon-oxygen-carbon (C-O-C) linkages that join monosaccharides together to form disaccharides, such as lactose or sucrose.
In this case, there would be 5 glycosidic linkages formed between the 13 monosaccharides to produce the 6 units of oligosaccharide.