Question 1

Instructions: Consider the reaction below to answer the following question(s).  
Refer to instructions.Compound Z is:

Accepted Answer

A) the D-anomer. 
B) the a-anomer. 
C) the b-anomer. 
D) the L-anomer. 
A) the D-anomer. 
B) the a-anomer. 
C) the b-anomer. 
D) the L-anomer.

Question 2

Instructions: Refer to the equilibrium below to answer the following question(s).

-Refer to instructions.Which enantiomer of ribose is drawn,D or L,and is it the a or b anomer?

Accepted Answer

The answer of Instructions: Refer to the equilibrium below to...

Question 3

Instructions: Choose a structure from the list provided below that best fits the description given.There is only one correct answer for each question.

-

Accepted Answer

The answer of Instructions: Choose a structure from the list...

Question 4

Instructions: Refer to the sugars below to answer the following question(s).Choose the sugar that best fits each description.There is only one correct answer for each question,but sugars may be used more than once.Indicate each answer by the corresponding letter.

-Refer to instructions._____ oxidizes to an optically inactive aldaric acid.

Accepted Answer

A) a 
B) b 
C) c 
D) d 
A) a 
B) b 
C) c 
D) d

Question 5

The specific rotation of the pure a-anomer of a monosaccharide is +169.7 and that of the pure b-anomer is +29.4.A solution of the pure a-anomer produces a specific rotation of +61.4.Based on this data,which of the following is correct?

Accepted Answer

A) The solution contains more of the a-anomer. 
B) The solution is an equimolar mixture of the two anomers. 
C) A solution of the pure b-anomer would produce the same specific rotation. 
D) The change in specific rotation is due to the irreversible formation of the open-chain monosaccharide. 
E) All of these. 
A) The solution contains more of the a-anomer. 
B) The solution is an equimolar mixture of the two anomers. 
C) A solution of the pure b-anomer would produce the same specific rotation. 
D) The change in specific rotation is due to the irreversible formation of the open-chain monosaccharide. 
E) All of these.

Question 6

Which of the following is a disaccharide?

Accepted Answer

A) glucose 
B) fructose 
C) sucrose 
D) N-acetylgalactosamine 
E) both c and d 
A) glucose 
B) fructose 
C) sucrose 
D) N-acetylgalactosamine 
E) both c and d

Question 7

Instructions: Refer to the equilibrium below to answer the following question(s).

-Refer to instructions.Classify ribose by carbonyl type and number of carbons.

Accepted Answer

Ribose is

Question 8

Instructions: Refer to the sugars below to answer the following question(s).Choose the sugar that best fits each description.There is only one correct answer for each question,but sugars may be used more than once.Indicate each answer by the corresponding letter.

-Refer to instructions._____ a ketose and _____ an aldose with two chirality centers

Accepted Answer

A) a 
B) b 
C) c 
D) d 
A) a 
B) b 
C) c 
D) d

Question 9

The brick-red color observed when Benedict's test is applied to D-mannose is due to

Accepted Answer

A) the reduced form of the Cu2+ reagent 
B) the reduced form of the D-mannose 
C) the oxidized form of the Cu2+ reagent 
D) the oxidized form of the D-mannose 
E) products in the mixture other than those listed 
A) the reduced form of the Cu2+ reagent 
B) the reduced form of the D-mannose 
C) the oxidized form of the Cu2+ reagent 
D) the oxidized form of the D-mannose 
E) products in the mixture other than those listed

Question 10

Draw the structure of the product of the following reaction.

Accepted Answer

The answer of Draw the structure of the product of...

Question 11

What is the correct structure for a-D-glucopyranose?

Accepted Answer

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

Question 12

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry.  
b-D-galactopyranose
Draw:
Ch3I,Ag2O

Accepted Answer

Question 13

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry.  
b-D-galactopyranose
Draw:
Br2,H2O

Accepted Answer

Question 14

Instructions: Consider the reaction below to answer the following question(s).  
Refer to instructions.Q and Z are cyclic examples of:

Accepted Answer

A) acetals 
B) hemiacetals 
C) alditols 
D) hemialditols 
A) acetals 
B) hemiacetals 
C) alditols 
D) hemialditols

Question 15

The monosaccharide shown below is

Accepted Answer

A) an aldohexose 
B) an aldopentose 
C) an aldotetrose 
D) a ketohexose 
E) a ketopentose 
A) an aldohexose 
B) an aldopentose 
C) an aldotetrose 
D) a ketohexose 
E) a ketopentose

Question 16

Draw an aldopentose with S,S,R stereochemistries at its carbons 2 through 4.

Accepted Answer

The answer of Draw an aldopentose with S,S,R stereochemistries at...

Question 17

Which of the following has a D-configuration?

Accepted Answer

A) only 1 and 2 
B) only 1 and 3 
C) only 2 and 3 
D) only 1,2 and 3 
A) only 1 and 2 
B) only 1 and 3 
C) only 2 and 3 
D) only 1,2 and 3

Question 18

Instructions: Refer to the monosaccharides below to answer the following question(s).Classify each sugar by type;for example,glucose is an aldohexose.

-Refer to instructions.Erythrulose is ____________________.

Accepted Answer

The answer of Instructions: Refer to the monosaccharides below to...

Question 19

Refer to the carbohydrate below to answer the following questions.
  
a)	Which carbon in the carbohydrate is the anomeric carbon?
b)	What would be observed on the addition of Tollen's reagent to a solution of this sugar?

Accepted Answer

a) a
b) The production of a si

Question 20

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry.  
b-D-galactopyranose
Draw:
NaBH4 in H2O

Accepted Answer

Exam 21: Biomolecules: Carbohydrates

Instructions: Consider the reaction below to answer the following question(s). Refer to instructions.Compound Z is:

Instructions: Refer to the equilibrium below to answer the following question(s). -Refer to instructions.Which enantiomer of ribose is drawn,D or L,and is it the a or b anomer?

Instructions: Choose a structure from the list provided below that best fits the description given.There is only one correct answer for each question. -

The specific rotation of the pure a-anomer of a monosaccharide is +169.7 and that of the pure b-anomer is +29.4.A solution of the pure a-anomer produces a specific rotation of +61.4.Based on this data,which of the following is correct?

Which of the following is a disaccharide?

Instructions: Refer to the equilibrium below to answer the following question(s). -Refer to instructions.Classify ribose by carbonyl type and number of carbons.

The brick-red color observed when Benedict's test is applied to D-mannose is due to

Draw the structure of the product of the following reaction.

What is the correct structure for a-D-glucopyranose?

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry. b-D-galactopyranose Draw: Ch3I,Ag2O

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry. b-D-galactopyranose Draw: Br2,H2O

Instructions: Consider the reaction below to answer the following question(s). Refer to instructions.Q and Z are cyclic examples of:

The monosaccharide shown below is

Draw an aldopentose with S,S,R stereochemistries at its carbons 2 through 4.

Which of the following has a D-configuration?

Instructions: Refer to the monosaccharides below to answer the following question(s).Classify each sugar by type;for example,glucose is an aldohexose. -Refer to instructions.Erythrulose is ____________________.

Refer to the carbohydrate below to answer the following questions. a) Which carbon in the carbohydrate is the anomeric carbon? b) What would be observed on the addition of Tollen's reagent to a solution of this sugar?

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry. b-D-galactopyranose Draw: NaBH4 in H2O

Structure and Bonding

Polar Covalent Bonds: Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols,phenols,and Thiols: Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Biomolecules: Amino Acids,peptides,and Proteins

Amino Acid Metabolism

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

Filters

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry. b-D-galactopyranose Draw: Ch₃I,Ag₂O

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry. b-D-galactopyranose Draw: Br₂,H₂O

Instructions: Draw structures for the products you would expect to obtain from reaction of b-D-galactopyranose with the listed reagents.Be sure to include all relevant stereochemistry. b-D-galactopyranose Draw: NaBH₄ in H₂O