Question :
31.In which of the following pairs of carbohydrates both members : 1309680
31.In which of the following pairs of carbohydrates are both members of the pair polysaccharides?
a.cellulose and cellobiose
b.starch and glycogen
c.amylose and lactose
d.more than one correct response
e.no correct response
32.In which of the following carbohydrates are two different types of glycosidic linkages present?
a.glycogen
b.lactose
c.amylose
d.more than one correct response
e.no correct response
33.Which of the following is a correct pairing of terms?
a.storage polysaccharide and cellulose
b.structural polysaccharide and starch
c.acidic polysaccharide and glycogen
d.more than one correct response
e.no correct response
34.Which of the following statements concerning the positioning of –OH groups in the Fischer projection for L-glucose is correct?
a.right on both carbons 2 and 3
b.right on both carbons 3 and 4
c.left at carbon 3 and right at carbon 5
d.more than one correct response
e.no correct response
35.Which of the following statements concerning the positioning of –OH groups in the Haworth projection for ?–D–glucose is correct?
a.up at carbons 1, 3, and 5
b.down at carbons 2, 3, and 4
c.up at carbons 1 and 3, and down at carbons 2 and 4
d.more than one correct response
e.no correct response
Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
a) All three statements are true.
b) Two of the three statements are true.
c) Only one of the statements is true.
d) None of the statements is true.
36.Statements:
(1) Glucose is both a hexose and a ketose.
(2) There can never be more than two enantiomers for a molecule.
(3) All common disaccharides have beta-one-four linkages.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
37.Statements:
(1) Complete hydrolysis of a oligosaccharide produces only monosaccharides.
(2) Fructose, galactose, and ribose are all hexoses.
(3) Both amylopectin and glycogen are branched glucose polymers.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
38.Statements:
(1) Diastereomers are stereoisomers whose molecules are mirror images of each other.
(2) Both cyclic forms of glucose contain a six-membered carbon ring.
(3) Complete hydrolysis of both maltose and cellobiose produce the same molecule.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
39.Statements:
(1) A Fischer projection is a three-dimensional notation for showing the spatial arrangements of groups of atoms about chiral centers in a molecule.
(2) Cyclic forms of aldoses result from intermolecular hemiacetal formation.
(3) All physical properties of enantiomers are the same.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
40.Statements:
(1) A positive Tollen’s test classifies a monosaccharide as a reducing sugar.
(2) The bond that links the two monosaccharides of a disaccharide together is a carbon-oxygen-carbon bond.
(3) Monosaccharides cannot be broken down into simpler units by hydrolysis reactions.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
41.Statements:
(1) Enantiomers with more than three carbon atoms must have the same handedness.
(2) The molecules glyceraldehyde and dihydroxyketone each contain one chiral center.
(3) Glucose contain one more -OH group than does galactose.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
42.Statements:
(1) Cellulose and amylose are glucose polymers that differ in the type of glycosidic linkage present.
(2) All monosaccharides are either aldoses or ketoses.
(3) Enantiomers can never be epimers.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
43.Statements:
(1) The term sugar is a general designation for both monosaccharides and disaccharides.
(2) The “highest-numbered” chiral center in a monosaccharide is used to determine D- or L-configuration.
(3) Sucrose is a reducing sugar and lactose is a nonreducing sugar.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
44.Statements:
(1) Mirror images of an achiral molecule are identical.
(2) All cyclic monosaccharides can exist in alpha- and beta-configurations.
(3) Reaction of an alcohol with a cyclic monosaccharide produces a glycoside.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
45.Statements:
(1) The biochemical basis for different types of blood is a system of polysaccharide markers attached to red blood cell membranes.
(2) Lactose intolerance is a genetic condition caused by excessive amounts of the enzyme lactase.
(3) Aspartame, the most used artificial sweetener, is an indigestible trisaccharide.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
