Question 1

The ketohexoses have fewer chiral carbon atoms than the aldohexoses.

Accepted Answer

A) True 
 B)False

Question 2

Cellulose cannot be degraded in cattle.

Accepted Answer

A) True 
 B)False

Question 3

Below is the Fischer projection of D-galactose. Which is the proper Haworth projection of β-D-galactopyranose?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 4

All D-enantiomers of carbohydrates are dextrorotatory.

Accepted Answer

A) True 
 B)False

Question 5

The simplest aldose is the chiral molecule glyceraldehyde.

Accepted Answer

A) True 
 B)False

Question 6

A reducing sugar is one that

Accepted Answer

A)  contains a b1→1) link. 
B)  has a hemiacetal group. 
C)  can reduce Cu2+ but not Ag+. 
D)  makes you lose weight. 
A)  contains a b1→1) link. 
B)  has a hemiacetal group. 
C)  can reduce Cu2+ but not Ag+. 
D)  makes you lose weight.

Question 7

Which are possible conformations of a furanose molecule?

Accepted Answer

A)  envelope and twist 
B)  chair and boat 
C)  cis and trans 
D)  A and B 
A)  envelope and twist 
B)  chair and boat 
C)  cis and trans 
D)  A and B

Question 8

The compounds α-D-fructofuranose and β-D-fructofuranose are .

Accepted Answer

A)  enantiomers 
B)  mutamers 
C)  anomers 
D)  conformational isomers 
A)  enantiomers 
B)  mutamers 
C)  anomers 
D)  conformational isomers

Question 9

Naturally occurring glycosides have roles in cells which include

Accepted Answer

A)  subunits of DNA. 
B)  chemical signals to plants. 
C)  food flavoring. 
D)  units in cell membrane structure. 
E)  All of the above 
A)  subunits of DNA. 
B)  chemical signals to plants. 
C)  food flavoring. 
D)  units in cell membrane structure. 
E)  All of the above

Question 10

What is the name of the disaccharide shown below that is formed by joining two monomers of D-glucose?

Accepted Answer

A)  β-D-glucopyranosyl-1→4)-β-D-glucopyranose 
B)  α-D-glucopyranosyl-1→4)-α-D-glucopyranose 
C)  β-D-glucofuranosyl-1→4)-β-D-glucofuranose 
D)  α-D-glucopyranosyl-1→3)-β-D-glucopyranose 
A)  β-D-glucopyranosyl-1→4)-β-D-glucopyranose 
B)  α-D-glucopyranosyl-1→4)-α-D-glucopyranose 
C)  β-D-glucofuranosyl-1→4)-β-D-glucofuranose 
D)  α-D-glucopyranosyl-1→3)-β-D-glucopyranose

Question 11

Which is a difference between maltose and cellobiose?

Accepted Answer

A)  One is in cellulose and the other in starch. 
B)  One is linear and the other is branched. 
C)  The glycosidic bond is different. 
D)  The subunit sugars are not glucose for both. 
E)  All of the above 
A)  One is in cellulose and the other in starch. 
B)  One is linear and the other is branched. 
C)  The glycosidic bond is different. 
D)  The subunit sugars are not glucose for both. 
E)  All of the above

Question 12

What type of bond links the monomers of a polysaccharide?

Accepted Answer

A)  glucotide bond 
B)  phosphate ester bond 
C)  peptide bond 
D)  glycosidic bond 
A)  glucotide bond 
B)  phosphate ester bond 
C)  peptide bond 
D)  glycosidic bond

Question 13

The large number of possible oligosaccharide structures in glycoproteins is limited in cells by the kinds of enzymes available for their synthesis.

Accepted Answer

A) True 
 B)False

Question 14

Anomers can be interconverted .

Accepted Answer

A)  by rotation about carbon-carbon bonds 
B)  via a linear intermediate 
C)  by an isotopic exchange reaction 
D)  None of the above. Anomers cannot be interconverted. 
A)  by rotation about carbon-carbon bonds 
B)  via a linear intermediate 
C)  by an isotopic exchange reaction 
D)  None of the above. Anomers cannot be interconverted.

Question 15

Which is a product of the intramolecular cyclization of D-tagatose to form a furanose?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 16

Which is not a similarity between glycogen and amylopectin?

Accepted Answer

A)  They each contain about 6000 glucose residues. 
B)  Each has one reducing end and many nonreducing ends. 
C)  Each is highly branched. 
D)  Each has branches of similar chain length. 
A)  They each contain about 6000 glucose residues. 
B)  Each has one reducing end and many nonreducing ends. 
C)  Each is highly branched. 
D)  Each has branches of similar chain length.

Question 17

The sugar derivative found in DNA is an oxidized form of ribose.

Accepted Answer

A) True 
 B)False

Question 18

Most of the carbohydrates on earth are produced by photosynthesis in plants.

Accepted Answer

A) True 
 B)False

Question 19

A monosaccharide whose anomeric carbon atom has a glycosidic bond to an alcohol, amine or thiol is a .

Accepted Answer

A)  glycoside 
B)  glycoprotein 
C)  heteroglycan 
D)  glucoconjugate 
A)  glycoside 
B)  glycoprotein 
C)  heteroglycan 
D)  glucoconjugate

Question 20

When a sugar polymer is analyzed and found to have equal portions of reducing and non-reducing ends, it is likely that

Accepted Answer

A)  it shows directionality. 
B)  it is linear. 
C)  it is branched. 
D)  it is branched, but not very highly. 
E)  some of the internal glycosidic bonds are in equilibrium with open chain forms. 
A)  it shows directionality. 
B)  it is linear. 
C)  it is branched. 
D)  it is branched, but not very highly. 
E)  some of the internal glycosidic bonds are in equilibrium with open chain forms.

Exam 8: Carbohydrates

The ketohexoses have fewer chiral carbon atoms than the aldohexoses.

Cellulose cannot be degraded in cattle.

Below is the Fischer projection of D-galactose. Which is the proper Haworth projection of β-D-galactopyranose?

All D-enantiomers of carbohydrates are dextrorotatory.

The simplest aldose is the chiral molecule glyceraldehyde.

A reducing sugar is one that

Which are possible conformations of a furanose molecule?

The compounds α-D-fructofuranose and β-D-fructofuranose are .

Naturally occurring glycosides have roles in cells which include

What is the name of the disaccharide shown below that is formed by joining two monomers of D-glucose?

Which is a difference between maltose and cellobiose?

What type of bond links the monomers of a polysaccharide?

The large number of possible oligosaccharide structures in glycoproteins is limited in cells by the kinds of enzymes available for their synthesis.

Anomers can be interconverted .

Which is a product of the intramolecular cyclization of D-tagatose to form a furanose?

Which is not a similarity between glycogen and amylopectin?

The sugar derivative found in DNA is an oxidized form of ribose.

Most of the carbohydrates on earth are produced by photosynthesis in plants.

A monosaccharide whose anomeric carbon atom has a glycosidic bond to an alcohol, amine or thiol is a .

When a sugar polymer is analyzed and found to have equal portions of reducing and non-reducing ends, it is likely that

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

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