Valencian Community PAU Biology Practice Questions - Valencian Community PAU Biology (Biologia 2o Bachillerato) Exam

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Structural polysaccharides like cellulose differ fundamentally from energy-storage polysaccharides like starch and glycogen because cellulose contains:

$$\beta(1 \rightarrow 4)$ glycosidic bonds forming unbranched straight chains stabilized by interchain hydrogen bonds. $$\alpha(1 \rightarrow 4)$ glycosidic bonds with frequent $\alpha(1 \rightarrow 6)$ branch points every 8–12 residues. Alternating N-acetylglucosamine and N-acetylmuramic acid units cross-linked by peptide bridges. Sulfated glycosaminoglycan disaccharide repeating units linked to core proteins.

Correct Answer:

$$\beta(1 \rightarrow 4)$ glycosidic bonds forming unbranched straight chains stabilized by interchain hydrogen bonds.

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