Question 1

Unlike proteins,whose primary structures are encoded in DNA,polysaccharides have very little structural variations.

Accepted Answer

A) True 
 B)False

Question 2

Which structure is NOT a carbohydrate?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 3

In solution only one anomeric form of a monosaccharide will be present.

Accepted Answer

A) True 
 B)False

Question 4

________ contain NeuNAc residues and sulfated sugars,and their negative charges contribute to the viscosity of mucins.

Accepted Answer

A) Proteoglycans 
B) N-linked polysaccharides 
C) O-linked polysaccharides 
D) Hyaluronic acid 
E) All of the above 
A) Proteoglycans 
B) N-linked polysaccharides 
C) O-linked polysaccharides 
D) Hyaluronic acid 
E) All of the above

Question 5

An oligosaccharide nodulation factor from one species can stimulate symbiosis in another species.

Accepted Answer

A) True 
 B)False

Question 6

The structure of D-arabinose is shown below.How many stereoisomers are possible for this molecule (including the one shown)?

Accepted Answer

A) One 
B) Four 
C) Six 
D) Eight 
A) One 
B) Four 
C) Six 
D) Eight

Question 7

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 8

A reducing sugar is one that

Accepted Answer

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

Question 9

The functional group shown is a(n)________.

Accepted Answer

A) hemiacetal 
B) hemiketal 
C) acetal 
D) ketal 
A) hemiacetal 
B) hemiketal 
C) acetal 
D) ketal

Question 10

The bacterial cell wall is sensitive to penicillin because it

Accepted Answer

A) blocks the linkage of the MurNAc and GlcNAc subunits. 
B) blocks the pentaglycine bridge cross linkage. 
C) binds to an enzyme which recognizes D-alanine-D-alanine dipeptide. 
D) is not attacked by enzymes in animal cells. 
E) All of the above. 
A) blocks the linkage of the MurNAc and GlcNAc subunits. 
B) blocks the pentaglycine bridge cross linkage. 
C) binds to an enzyme which recognizes D-alanine-D-alanine dipeptide. 
D) is not attacked by enzymes in animal cells. 
E) All of the above.

Question 11

Select the correct description from this list for the following terms:
-oligosaccharides with various combinations of gal,fuc,GlcNAc and sialic acid

Accepted Answer

A) nodulation factor 
B) H antigen (blood groups) 
C) hyaluronic acid 
D) aggrecan 
E) bacterial cell wall (peptidoglycan) 
A) nodulation factor 
B) H antigen (blood groups) 
C) hyaluronic acid 
D) aggrecan 
E) bacterial cell wall (peptidoglycan)

Question 12

DNA could be referred to as a glycoside.

Accepted Answer

A) True 
 B)False

Question 13

The structure of a disaccharide is shown below.Which statement applies?

Accepted Answer

A) Both rings A and B are in equilibrium with an open chain form. 
B) Only ring A is in equilibrium with an open chain form. 
C) Only ring B is in equilibrium with an open chain form. 
D) Neither ring is in equilibrium with an open chain form. 
A) Both rings A and B are in equilibrium with an open chain form. 
B) Only ring A is in equilibrium with an open chain form. 
C) Only ring B is in equilibrium with an open chain form. 
D) Neither ring is in equilibrium with an open chain form.

Question 14

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 15

The ketohexoses have fewer chiral carbon atoms than the aldohexoses.

Accepted Answer

A) True 
 B)False

Question 16

Select the correct description from this list for the following terms:
-glycosaminoglycan in fluids of joints and in cartilage

Accepted Answer

A) nodulation factor 
B) H antigen (blood groups) 
C) hyaluronic acid 
D) aggrecan 
E) bacterial cell wall (peptidoglycan) 
A) nodulation factor 
B) H antigen (blood groups) 
C) hyaluronic acid 
D) aggrecan 
E) bacterial cell wall (peptidoglycan)

Question 17

Pyranose rings are usually most stable when the ring adopts a ________ conformation with the bulkiest ring substituents in ________ positions.

Accepted Answer

A) chair;equatorial 
B) chair;axial 
C) boat;equatorial 
D) boat;axial 
A) chair;equatorial 
B) chair;axial 
C) boat;equatorial 
D) boat;axial

Question 18

The heteroglycan component of the cell wall is the same in all bacteria,but the cross-linking polypeptide is not.

Accepted Answer

A) True 
 B)False

Question 19

Which classification(s)is(are)applicable to maltose?

Accepted Answer

A) Nonreducing sugar. 
B) Reducing sugar. 
C) Peptidoglycan. 
D) Glucoside. 
E) Both B and D. 
A) Nonreducing sugar. 
B) Reducing sugar. 
C) Peptidoglycan. 
D) Glucoside. 
E) Both B and D.

Question 20

Naturally occurring glycosides have roles in cells which include

Accepted Answer

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

Exam 8: Carbohydrates

Unlike proteins,whose primary structures are encoded in DNA,polysaccharides have very little structural variations.

Which structure is NOT a carbohydrate?

In solution only one anomeric form of a monosaccharide will be present.

________ contain NeuNAc residues and sulfated sugars,and their negative charges contribute to the viscosity of mucins.

An oligosaccharide nodulation factor from one species can stimulate symbiosis in another species.

The structure of D-arabinose is shown below.How many stereoisomers are possible for this molecule (including the one shown)?

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

A reducing sugar is one that

The functional group shown is a(n)________.

The bacterial cell wall is sensitive to penicillin because it

Select the correct description from this list for the following terms: -oligosaccharides with various combinations of gal,fuc,GlcNAc and sialic acid

DNA could be referred to as a glycoside.

The structure of a disaccharide is shown below.Which statement applies?

Which is a difference between maltose and cellobiose?

The ketohexoses have fewer chiral carbon atoms than the aldohexoses.

Select the correct description from this list for the following terms: -glycosaminoglycan in fluids of joints and in cartilage

Pyranose rings are usually most stable when the ring adopts a ________ conformation with the bulkiest ring substituents in ________ positions.

The heteroglycan component of the cell wall is the same in all bacteria,but the cross-linking polypeptide is not.

Which classification(s)is(are)applicable to maltose?

Naturally occurring glycosides have roles in cells which include

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 Atp Synthesis

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters

Pyranose rings are usually most stable when the ring adopts a conformation with the bulkiest ring substituents in positions.