A-LevelBiologyEnzymes9700/12 · May/June 2017 · Q81 Mark
Complete digestion of polysaccharides requires all the glycosidic bonds between the monomers to be broken. Amylase only breaks α-1,4 glycosidic bonds. Which row shows how completely amylase can digest molecules of cellulose, amylopectin or amylose? [Table showing digestion results for cellulose, amylopectin, amylose with a key]
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Acellulose -, amylopectin ++, amylose +
Bcellulose -, amylopectin +, amylose ++
Ccellulose +, amylopectin ++, amylose +
Dcellulose ++, amylopectin -, amylose +
✓ Correct answer
B: cellulose -, amylopectin +, amylose ++
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