A-LevelBiologyBiological molecules9700/12 · May/June 2025 · Q91 Mark
Amylose, amylopectin and glycogen are all polysaccharides. Enzyme X removes one maltose molecule at a time from the ends of a polysaccharide molecule by hydrolysis of α-1,4-glycosidic bonds. Which row shows how completely each of these molecules will be hydrolysed by enzyme X? (Assume that each polysaccharide is composed of the same number of monomers before hydrolysis begins.)
Aleast completely hydrolysed: amylose, amylopectin, most completely hydrolysed: glycogen
Bleast completely hydrolysed: amylose, glycogen, most completely hydrolysed: amylopectin
Cleast completely hydrolysed: glycogen, amylose, most completely hydrolysed: amylopectin
Dleast completely hydrolysed: glycogen, amylopectin, most completely hydrolysed: amylose
✓ Correct answer
D: least completely hydrolysed: glycogen, amylopectin, most completely hydrolysed: amylose
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