Question 1

Chitin differs from cellulose due to

Accepted Answer

A) inversion of configuration at the anomeric carbon. 
B) sulfonation of the C2 OH group. 
C) a much greater prevalence of branching. 
D) replacement of the C2 OH group by an acetamido group. 
E) replacement of the C6 OH group by an amino group. 
A) inversion of configuration at the anomeric carbon. 
B) sulfonation of the C2 OH group. 
C) a much greater prevalence of branching. 
D) replacement of the C2 OH group by an acetamido group. 
E) replacement of the C6 OH group by an amino group.

Question 2

Which of the following is a disaccharide?

Accepted Answer

A) amylose 
B) saccharin 
C) aspartame 
D) amylopectin 
E) none of the above 
A) amylose 
B) saccharin 
C) aspartame 
D) amylopectin 
E) none of the above

Question 3

-Which of the structures shown in the figure above is galactose?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) None of the above 
A) A 
B) B 
C) C 
D) D 
E) None of the above

Question 4

Which of the following sugars is not a reducing sugar?

Accepted Answer

A) glucose 
B) ribose 
C) sucrose 
D) starch 
E) galactose 
A) glucose 
B) ribose 
C) sucrose 
D) starch 
E) galactose

Question 5

The structure below shows a Fischer projection of D-idose.  
Which of the structures below represents $\beta$-D-idopyranose

Accepted Answer

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

Question 6

-The structure shown in the figure above represents a

Accepted Answer

A) glucopyranose. 
B) ribofuranose. 
C) myo-inositol. 
D) fructofuranose. 
E) glucofuranose. 
A) glucopyranose. 
B) ribofuranose. 
C) myo-inositol. 
D) fructofuranose. 
E) glucofuranose.

Question 7

-Which two sugars shown in the figure above are epimers?

Accepted Answer

A) A and B 
B) B and C 
C) C and D 
D) A and D 
E) None of the above 
A) A and B 
B) B and C 
C) C and D 
D) A and D 
E) None of the above

Question 8

Which of these polysaccharides is a branched polymer?

Accepted Answer

A) chitin 
B) amylose 
C) cellulose 
D) amylopectin 
E) hyaluronic acid 
A) chitin 
B) amylose 
C) cellulose 
D) amylopectin 
E) hyaluronic acid

Question 9

Matching

-The ______ sugars are monosaccharides in which a hydroxyl group is replaced with a hydrogen atom.

Accepted Answer

A)  eight 
B)  deoxy 
C)  peptidoglycan 
D)  axial 
E)  anomers
F) two
G) lactose
H) glyceraldehyde
I) amylopectin
J) epimers
K) sixteen
L) glycogen
M) equatorial
N) chitin
O) hyaluronic acid
P) amylose 
A)  eight 
B)  deoxy 
C)  peptidoglycan 
D)  axial 
E)  anomers
F) two
G) lactose
H) glyceraldehyde
I) amylopectin
J) epimers
K) sixteen
L) glycogen
M) equatorial
N) chitin
O) hyaluronic acid
P) amylose

Question 10

We encounter a great variety of sugars in living organisms.
a.Are most carbohydrates in living organisms D or L?
b.Draw a Fischer projection of the smallest aldose (include all atoms).
c.What is the name of this molecule?

Accepted Answer

a.D @#IMG-DLM& 
b.se

Question 11

O-linked oligosaccharides are commonly attached to the -OH group of _____.

Accepted Answer

A) ribose 
B) tyrosine 
C) lysine 
D) threonine 
E) glycine 
A) ribose 
B) tyrosine 
C) lysine 
D) threonine 
E) glycine

Question 12

Matching

-______ is a homopolymer composed of $\beta$(1-4)-linked N-acetyl-D-glucosamine residues that is the principle structural component of the exoskeleton of various groups of invertebrates.

Accepted Answer

A)  eight 
B)  deoxy 
C)  peptidoglycan 
D)  axial 
E)  anomers
F) two
G) lactose
H) glyceraldehyde
I) amylopectin
J) epimers
K) sixteen
L) glycogen
M) equatorial
N) chitin
O) hyaluronic acid
P) amylose 
A)  eight 
B)  deoxy 
C)  peptidoglycan 
D)  axial 
E)  anomers
F) two
G) lactose
H) glyceraldehyde
I) amylopectin
J) epimers
K) sixteen
L) glycogen
M) equatorial
N) chitin
O) hyaluronic acid
P) amylose

Question 13

The drawing below shows the structure of the disaccharide sucrose.   
a.What are the names of the two monosaccharides that form sucrose?
b.Draw squares around the carbons that determine the designation D or L for each of the monosaccharides.
c.Draw circles around the anomeric carbon atoms on the drawing.
d.Indicate on the drawing for each of the anomeric carbon atoms whether they are in the $\alpha$ or the $\beta$ configuration.
e.Is sucrose a reducing sugar? Explain your answer in one sentence.

Accepted Answer

a.glucose (glucopyranose)and f

Question 14

Which of the following sequences represents a recognition site for N-linked glycosylation where X is any amino acid except Pro?

Accepted Answer

A) Gln-X-Ser 
B) His-X-Ser 
C) Arg-X-Ser 
D) Asn-X-Ser 
E) Asp-X-Ser 
A) Gln-X-Ser 
B) His-X-Ser 
C) Arg-X-Ser 
D) Asn-X-Ser 
E) Asp-X-Ser

Question 15

Which of the following is the most abundant disaccharide?

Accepted Answer

A) lactose 
B) cellulose 
C) α-amylose 
D) maltose 
E) sucrose 
A) lactose 
B) cellulose 
C) α-amylose 
D) maltose 
E) sucrose

Question 16

Which of the structures below represents a glucoside?

Accepted Answer

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

Question 17

Which of the following is an example of a heteropolysaccharide?

Accepted Answer

A) cellulose 
B) chitin 
C) starch 
D) glycogen 
E) hyaluronic acid 
A) cellulose 
B) chitin 
C) starch 
D) glycogen 
E) hyaluronic acid

Question 18

Uronic acids

Accepted Answer

A) are aldoses where the aldehyde is oxidized to a carboxylic acid. 
B) are aldoses where the 1° alcohol is oxidized to a carboxylic acid. 
C) can be found in the pyranose or furanose forms. 
D) A and C are both correct. 
E) B and C are both correct. 
A) are aldoses where the aldehyde is oxidized to a carboxylic acid. 
B) are aldoses where the 1° alcohol is oxidized to a carboxylic acid. 
C) can be found in the pyranose or furanose forms. 
D) A and C are both correct. 
E) B and C are both correct.

Question 19

The sialic acids

Accepted Answer

A) are important constituents of glycoproteins and glycolipids. 
B) are N-acetyl glucosamine derivatives. 
C) incorporate a succinic acid derivative. 
D) all of the above 
E) none of the above 
A) are important constituents of glycoproteins and glycolipids. 
B) are N-acetyl glucosamine derivatives. 
C) incorporate a succinic acid derivative. 
D) all of the above 
E) none of the above

Question 20

Which polysaccharide is found in a helically coiled conformation?

Accepted Answer

A) chitin 
B) α-amylose 
C) cellulose 
D) lignin 
E) none of the above 
A) chitin 
B) α-amylose 
C) cellulose 
D) lignin 
E) none of the above

Exam 8: Carbohydrates

Chitin differs from cellulose due to

Which of the following is a disaccharide?

-Which of the structures shown in the figure above is galactose?

Which of the following sugars is not a reducing sugar?

The structure below shows a Fischer projection of D-idose. Which of the structures below represents β\betaβ -D-idopyranose

-The structure shown in the figure above represents a

-Which two sugars shown in the figure above are epimers?

Which of these polysaccharides is a branched polymer?

Matching -The ______ sugars are monosaccharides in which a hydroxyl group is replaced with a hydrogen atom.

We encounter a great variety of sugars in living organisms. a.Are most carbohydrates in living organisms D or L? b.Draw a Fischer projection of the smallest aldose (include all atoms). c.What is the name of this molecule?

O-linked oligosaccharides are commonly attached to the -OH group of _____.

Matching -______ is a homopolymer composed of β\betaβ (1-4)-linked N-acetyl-D-glucosamine residues that is the principle structural component of the exoskeleton of various groups of invertebrates.

Which of the following sequences represents a recognition site for N-linked glycosylation where X is any amino acid except Pro?

Which of the following is the most abundant disaccharide?

Which of the structures below represents a glucoside?

Which of the following is an example of a heteropolysaccharide?

Uronic acids

The sialic acids

Which polysaccharide is found in a helically coiled conformation?

Introduction to the Chemistry of Life

Water

Nucleotides, nucleic Acids, and Genetic Information

Amino Acids

Proteins: Primary Structure

Proteins: Three-Dimensional Structure

Protein Function Part I: Myoglobin and Hemoglobin

Lipids and Biological Membranes

Membrane Transport

Enzyme Catalysis

Enzyme Kinetics, inhibition and Control

Biochemical Signaling

Introduction to Metabolism

Glucose Catabolism

Glycogen Metabolism and Gluconeogenesis

Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Lipid Metabolism

Amino Acid Metabolism

Mammalian Fuel Metabolism: Integration and Regulation

Nucleotide Metabolism

Nucleic Acid Structure

DNA Replication, repair and Recombination

Transcription and Rna Processing

Protein Synthesis

Regulation of Gene Expression

Filters

The structure below shows a Fischer projection of D-idose. $The structure below shows a Fischer projection of D-idose. Which of the structures below represents \beta -D-idopyranose$ Which of the structures below represents $\beta$ -D-idopyranose

Matching -______ is a homopolymer composed of $\beta$ (1-4)-linked N-acetyl-D-glucosamine residues that is the principle structural component of the exoskeleton of various groups of invertebrates.