Question 1

Which of the following "dash-wedge" (zig-zag)structures correctly depicts D-Glucose?

Accepted Answer

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

Question 2

The carbohydrate structures below are related as

Accepted Answer

A)  Anomers 
B)  Enantiomers 
C)  Diastereomers 
D)  D and L stereoisomers 
E)  both B and D 
A)  Anomers 
B)  Enantiomers 
C)  Diastereomers 
D)  D and L stereoisomers 
E)  both B and D E

Question 3

What would be the name of the following sugar structure?

Accepted Answer

A)  (F1F1F1S1F1F1F10-D-galactopyranose) 
B)  (F1F1F1S1F1F1F10-D-glucopyranose) 
C)  (F1F1F1S1F1F1F10-D-galactopyranose) 
D)  (F1F1F1S1F1F1F10-D-glucopyranose) 
E)  (F1F1F1S1F1F1F10-D-galactofuranose) 
A)  (F1F1F1S1F1F1F10-D-galactopyranose) 
B)  (F1F1F1S1F1F1F10-D-glucopyranose) 
C)  (F1F1F1S1F1F1F10-D-galactopyranose) 
D)  (F1F1F1S1F1F1F10-D-glucopyranose) 
E)  (F1F1F1S1F1F1F10-D-galactofuranose) B

Question 4

Bromine is a dense,deep red-brown liquid obtained by the oxidation of bromide ion in seawater.Bromine is very toxic.Which of the following reactions of bromine with organic materials would be least likely in a biological system (would not occur)?

Accepted Answer

A)  Addition to non-aromatic carbon-carbon double bonds (e.g.,in fatty acids) 
B)  Electrophillic aromatic substitution of very activated aromatic rings (e.g.,in tyrosine,a phenol) 
C)  Oxidation of aldoses to aldonic acids (e.g.,CHO to CO2 
D)  (F1F1F1S1F1F1F10-bromination of fatty acids (e.g.,RCH2CO2H F1F1F1S1F1F1F10 RCHBrCO2H)) 
E)  None of these reactions could occur in living systems. 
A)  Addition to non-aromatic carbon-carbon double bonds (e.g.,in fatty acids) 
B)  Electrophillic aromatic substitution of very activated aromatic rings (e.g.,in tyrosine,a phenol) 
C)  Oxidation of aldoses to aldonic acids (e.g.,CHO to CO2 
D)  (F1F1F1S1F1F1F10-bromination of fatty acids (e.g.,RCH2CO2H F1F1F1S1F1F1F10 RCHBrCO2H)) 
E)  None of these reactions could occur in living systems.

Question 5

Which of the following conformations correctly depicts the structure of: F1F1F1S1F1F1F10-D-(+)-Glucopyranose?

Accepted Answer

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

Question 6

Qualitatively (not quantitatively),what products would be formed from the following reaction?

Accepted Answer

A)  CO2 
B)  CH2O 
C) 
  
D)  both B and C 
E)  A,B and C 
A)  CO2 
B)  CH2O 
C) 
  
D)  both B and C 
E)  A,B and C

Question 7

Which of the following would you expect to exhibit mutarotation?

Accepted Answer

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

Question 8

Which one of the following could not rotate plane polarized light?

Accepted Answer

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

Question 9

Which of the following represents an L sugar?

Accepted Answer

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

Question 10

What would result from the reaction shown below?

Accepted Answer

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

Question 11

Which of the following arrows correctly points to the anomeric carbon?

Accepted Answer

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

Question 12

Periodic acid degradation of the following carbohydrate will yield (quantitatively)what products?

Accepted Answer

A)  4 HCO2H + 1 CO2 
B)  3 HCO2H + 1 HCHO + 1 CO2 
C)  4 HCO2H + 1 HCHO 
D)  5 HCHO 
E)  4 HCHO + 1 CO2 
A)  4 HCO2H + 1 CO2 
B)  3 HCO2H + 1 HCHO + 1 CO2 
C)  4 HCO2H + 1 HCHO 
D)  5 HCHO 
E)  4 HCHO + 1 CO2

Question 13

What would result from the following series of reactions?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E)  both A and C 
A) 
  
B) 
  
C) 
  
D) 
  
E)  both A and C

Question 14

Which of the following would be a reducing sugar (i.e.,react with Ag+)?

Accepted Answer

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

Question 15

D-(+)-Glucose and D-(+)-Mannose have the same molecular formula (C6H12O6).Which of the following describes the relationship between these two sugars?

Accepted Answer

A)  Constitutional isomers 
B)  Diastereomers 
C)  Enantiomers 
D)  Anomers 
E)  no correct answer 
A)  Constitutional isomers 
B)  Diastereomers 
C)  Enantiomers 
D)  Anomers 
E)  no correct answer

Question 16

What would result from the reactions shown below?

Accepted Answer

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

Question 17

What would be the name of the following sugar?

Accepted Answer

A)  D-glucose 
B)  L-glucose 
C)  L-galactose 
D)  L-mannose 
E)  D-mannose 
A)  D-glucose 
B)  L-glucose 
C)  L-galactose 
D)  L-mannose 
E)  D-mannose

Question 18

Which of the following is referred to as the anomeric carbon?

Accepted Answer

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

Question 19

The main difference between the two forms of starch,amylose and amylopectin,is what?

Accepted Answer

A)  Amylose is more soluble in water than is amylopectin. 
B)  Amylose is a linear polymer while amylopectin is branched. 
C)  Amylopectin has a lower molecular weight than amylose. 
D)  Amylose is metabolized in mammals,while amylopectin is not. 
E)  Amylopectin is metabolized in mammals,while amylose is not. 
A)  Amylose is more soluble in water than is amylopectin. 
B)  Amylose is a linear polymer while amylopectin is branched. 
C)  Amylopectin has a lower molecular weight than amylose. 
D)  Amylose is metabolized in mammals,while amylopectin is not. 
E)  Amylopectin is metabolized in mammals,while amylose is not.

Question 20

Which polysaccharide has F1F1F1S1F1F1F10-1,4 glycosidic bonds?

Accepted Answer

A)  Cellulose 
B)  Glycogen 
C)  Amylose 
D)  Amylpectin 
E)  B,C,and D 
A)  Cellulose 
B)  Glycogen 
C)  Amylose 
D)  Amylpectin 
E)  B,C,and D

Exam 24: Carbohydrates: Polyfunctional Compounds in Nature

Which of the following "dash-wedge" (zig-zag)structures correctly depicts D-Glucose?

The carbohydrate structures below are related as

What would be the name of the following sugar structure?

Bromine is a dense,deep red-brown liquid obtained by the oxidation of bromide ion in seawater.Bromine is very toxic.Which of the following reactions of bromine with organic materials would be least likely in a biological system (would not occur)?

Which of the following conformations correctly depicts the structure of: -D-(+)-Glucopyranose?

Qualitatively (not quantitatively),what products would be formed from the following reaction?

Which of the following would you expect to exhibit mutarotation?

Which one of the following could not rotate plane polarized light?

Which of the following represents an L sugar?

What would result from the reaction shown below?

Which of the following arrows correctly points to the anomeric carbon?

Periodic acid degradation of the following carbohydrate will yield (quantitatively)what products?

What would result from the following series of reactions?

Which of the following would be a reducing sugar (i.e.,react with Ag+)?

D-(+)-Glucose and D-(+)-Mannose have the same molecular formula (C6H12O6).Which of the following describes the relationship between these two sugars?

What would result from the reactions shown below?

What would be the name of the following sugar?

Which of the following is referred to as the anomeric carbon?

The main difference between the two forms of starch,amylose and amylopectin,is what?

Which polysaccharide has -1,4 glycosidic bonds?

Structure and Bonding in Organic Molecules

Structure and Reactivity: Acids and Bases,polar and Nonpolar Molecules

Reactions of Alkanes: Bond-Dissociation Energies,radical Halogenation,and Relative Reactivity

Cycloalkanes

Stereoisomers

Properties and Reactions of Haloalkanes: Bimolecular Nucleophilic Substitution

Further Reactions of Haloalkanes: Unimolecular Substitution and Pathways of Elimination

Hydroxy of Functional Group: Alcohols: Properties,preparation,and Strategy of Synthesis

Further Reactions of Alcohols and the Chemistry of Ethers

Using Nuclear Magnetic Resonance Spectroscopy to Deduce Structure

Alkenes: Infrared Spectroscopy and Mass Spectrometry

Reactions to Alkenes

Alkynes: the Carbon

Delocalized Pi Systems: Investigation by Ultraviolet and Visible Spectroscopy Interlude

Benzene and Aromaticity: Electrophilic Aromatic Substitution

Electrophilic Attack on Derivatives of Benzene: Substituents Control Regioselectivity

Aldehydes and Ketones: the Carbonyl Group

Enols,enolates,and the Aldol Condensation: A,b-Unsaturated Aldehydes and Ketones

Carboxylic Acids

Carboxylic Acid Derivatives

Amines and Their Derivatives: Functional Groups Containing Nitrogen

Chemistry of the Benzene Substituents: Alkylbenzenes,phenols,and Benzenamines

Ester Enolates and the Claisen Condensation: Synthesis of B-Dicarbonyl Compounds; Acyl Anion Equivalents

Heterocycles: Heteroatoms in Cyclic Organic Compounds

Amino Acids,peptides,proteins,and Nucleic Acids: Nitrogen-Containing Polymers in Nature

Filters

D-(+)-Glucose and D-(+)-Mannose have the same molecular formula (C₆H₁₂O₆).Which of the following describes the relationship between these two sugars?