Quiz
Chapter 8
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Perguntas do quiz (12)
1Are the following two sugars epimers of each other?
D-sorbose and D-psicose- Ayes
- Bno
- Cmaybe
- Dinsufficient info
2Are the following two sugars epimers of each other?
D-sorbose and D-fructose- Ayes
- Bno
- Cmaybe
- Dinsufficient info
3 Are the following two sugars epimers of each other?
D-erythrose and D-arabinose- Ayes
- Bno
- Cmaybe
- Dinsufficient info
4Are the following two sugars epimers of each other?
D- fructose and L-fructose- Ayes
- Bno
- Cmaybe
- Dinsufficient info
5Are the following two sugars epimers of each other?
D- arabinose and D-ribose- Ayes
- Bno
- Cmaybe
- Dinsufficient info
6Are the following two sugars epimers of each other?
D- ribose and D-ribulose- Ayes
- Bno
- Cmaybe
- Dinsufficient info
7The sucrose substitute tagatose (Fig. 8-2) is produced by hydrolyzing lactose and then chemically converting one of the two resulting aldoses to a ketose. Which of the following residues gives rise to tagatose?
- Aglucose
- Bgulose
- Cgalactose
- Dmannose
8Use the following information to deduce which of the following is the correct structure of the disaccharide trehalose. Complete hydrolysis yields only D-glucose; it is hydrolyzed by a-glucosidase but not beta-glucosidase; and it does not reduce Cu2+ to Cu+.
- Aalpha-D-glucose-(1 à4)- alpha-D-glucose or alpha-D-glucose-(1 à4)- beta-D-glucose
- Balpha-D-glucose-(1 à6)-alpha-D-glucose or alpha-D-glucose-(1 à6)-beta-D-glucose
- Cbeta-D-glucose-(1 à6)-beta-D-glucose or beta-D-glucose-(1 à6)-alpha-D-glucose
- Dalpha-D-glucose-(1 à1)-alpha-D-glucose or alpha-D-glucose-(1 à1)-beta-D-glucose
9When exposed to dehydrating conditions, many plants and invertebrates synthesize large amounts of trehalose, which enables them to survive prolonged desiccation. Which of the following is the correct property of the trehalose molecule that might allow it to act as a water substitute?
- AThe relatively few hydrogen-bonding hydroxyl groups of the disaccharide act as poor substitutes for water molecules. Because trehalose is a reducing sugar, it is unlikely to participate in oxidation-reduction reactions with other biomolecules when it is present in high concentrations.
- BThe relatively few hydrogen-bonding carboxyl groups of the disaccharide act as substitutes for water molecules. Because trehalose is a reducing sugar, it is unlikely to participate in acid-base reactions with other biomolecules when it is present in high concentrations.
- CThe numerous hydrogen-bonding hydroxyl groups of the disaccharide act as substitutes for water molecules. Because trehalose is a nonreducing sugar, it is unlikely to participate in oxidation-reduction reactions with other biomolecules when it is present in high concentrations.
- DThe numerous hydrogen-bonding hydroxy groups of the disaccharide act as substitutes for water molecules. Because trehalose is a reducing sugar, it is unlikely to participate in acid-base reactions with other biomolecules when it is present in high concentrations.
10Which of the following is the correct structure for the artificial sweetener sucralose?
- Aa
- Bb
- Cc
- Dd
- Aa
11Identify the monosaccharides and their linkages in the image of the attached disaccharide.
- AGalactose is linked to fructose by a beta(1à6) bond.
- BGalactose is linked to fructose by an alpha(1à5) bond.
- CGlucose is linked to fructose by an alpha(1à6) bond.
- DGlucose is linked to fructose by beta(1à6) bond.
12“Neutraceuticals” are products that are believed to have some beneficial effect but are not strictly defined as either food or drug. Which one of the following is the best possible reason as to why an individual suffering from osteoarthritis might be tempted to consume the neutraceutical glucosamine?
- AGlucosamine is the building block of the heparin-sulfate component of bacterial peptidoglycans. Boosting the body’s supply of glucosamine might inhibit the bacteria responsible for the disease osteoarthritis, which is characterized by the degradation of peptidoglycan-rich articular (relating to a joint) cartilage.
- BGlucosamine is a building block of certain glucosaminoglycan components of proteoglycans. Boosting the body’s supply of glucosamine might slow progression of the disease osteoarthritis, which is characterized by the degradation of proteoglycan-rich articular (relating to a joint) cartilage.
- CGlucosamine is a byproduct of certain glucosaminoglycan reactions that occur during the progression of the disease osteoarthritis. Thus boosting the body’s supply of glucosamine might enhance the immune response and slow down the progression of osteoarthritis, which is characterized by the degradation of proteoglycan-rich articular (relating to a joint) cartilage.
- DGlucosamine is a building block of the extracelluar matrix of mammalian joints. Boosting the body’s supply of glucosamine will increase the density of the extracellular matrix and thus block the natural progression of the disease osteoporosis.
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- Chem 365 Quiz sobre Chapter 8, criado por Crisila A em 02-11-2020.
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- Crisila A
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- English
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