Identifying Glycosidic Bond Types from Structural Diagram

Steps:

• Locate the anomeric carbons (C1) in the monosaccharide units of the polysaccharide.
• Determine bond orientation: α if the glycosidic oxygen is below the ring plane in Haworth projection, β if above.
• Identify linkage positions: α-1 or β-1 based on C1 connections to other carbons.
• Confirm presence of both α-1 and β-1 bonds without α-4, β-4, or β-6.

Why C is correct:

• Polysaccharide structures like cellulose or starch derivatives feature α-1 (e.g., axial linkage in glucose) and β-1 (e.g., equatorial linkage) bonds, matching the diagram's mixed configurations.

Why the others are wrong:

• A: Diagram lacks α-4 linkages, typical of amylose but not shown here.
• B: No β-4 bonds present; β-4 defines cellulose, absent in this structure.
• D: β-6 bonds occur in branching (e.g., glycogen), but diagram shows only 1-position variations.

Final answer: C