Chapter 8: 5P (page 243)
Draw the furanose and pyranose forms of D-ribose.
Short Answer
(a) Furanose
(b) Pyranose
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Chapter 8: 5P (page 243)
Draw the furanose and pyranose forms of D-ribose.
(a) Furanose
(b) Pyranose
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How many reducing ends are in a molecule of glycogen that contains 10,000 residues with a branch every 10 residues?
Explain why a sugar can form at least two different glycosides.
Human milk contains the oligosaccharide 2′-fucosyllactose (α-L fucose-(1→2)-β-D-galactose-(1→4)-D-glucose), which may help protect the newborn from bacterial infections. Draw the structure of this oligosaccharide.
(a) Deduce the structure of the disaccharide trehalose from the following information: Complete hydrolysis yields only D-glucose; it is hydrolyzed by α-glucosidase but not β-glucosidase; and it does not reduce Cu2+to Cu+. (b) When exposed to dehydrating conditions, many plants and invertebrates synthesize large amounts of trehalose, which enables them to survive prolonged desiccation. What properties of the trehalose molecule might allow it to act as a water substitute?
Is amylose or amylopectin more likely to be a long-term storage polysaccharide in plants?
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