Question 1

Show the hydrogen bonding which occurs when adenine and thymine form a base pair.

Accepted Answer

The answer of Show the hydrogen bonding which occurs when...

Question 2

When L-erythrose is treated with NaBH4, ________.

Accepted Answer

A)  a 70:30 mixture of enantiomeric alditols results 
B)  a 50:50 mixture of enantiomeric alditols results 
C)  a meso alditol is produced 
D)  the product mixture contains two diastereomeric alditols 
E)  an optically active alditol is produced 
A)  a 70:30 mixture of enantiomeric alditols results 
B)  a 50:50 mixture of enantiomeric alditols results 
C)  a meso alditol is produced 
D)  the product mixture contains two diastereomeric alditols 
E)  an optically active alditol is produced C

Question 3

Draw the Haworth structure of the α-furanose form of the monosaccharide shown below.

Accepted Answer

The answer of Draw the Haworth structure of the α-furanose...

Question 4

Draw the Haworth structure of the β-pyranose form of the monosaccharide shown below.

Accepted Answer

The answer of Draw the Haworth structure of the β-pyranose...

Question 5

Under what conditions is the methyl glycoside of galactose prepared?

Accepted Answer

CH₃OH, H⁺ (n

Question 6

When D-(+)-allose is treated with bromine water, which of the following results?

Accepted Answer

A)  a racemic mixture of aldaric acids 
B)  an optically active aldaric acid 
C)  an optically inactive aldaric acid 
D)  an optically active aldonic acid 
E)  an optically inactive aldonic acid 
A)  a racemic mixture of aldaric acids 
B)  an optically active aldaric acid 
C)  an optically inactive aldaric acid 
D)  an optically active aldonic acid 
E)  an optically inactive aldonic acid

Question 7

What is the major organic product of the following reaction?

Accepted Answer

The answer of What is the major organic product of...

Question 8

The structure of D-arabinose is shown below. Which of the following correctly describes the configurations of the asymmetric carbons in D-arabinose?

Accepted Answer

A)  2S, 3R, 4R 
B)  2R, 3S, 4S 
C)  2S, 3R, 4S 
D)  2R, 3S, 4R 
E)  2S, 3S, 4R 
A)  2S, 3R, 4R 
B)  2R, 3S, 4S 
C)  2S, 3R, 4S 
D)  2R, 3S, 4R 
E)  2S, 3S, 4R

Question 9

Draw the product of the following reaction in a Fischer projection.

Accepted Answer

The answer of Draw the product of the following reaction...

Question 10

Which of the following descriptions apply to both dihydroxyacetone and D-fructofuranose?
I. They are both ketoses.
II. They are both aldoses.
III. They are enatiomers of each other.
IV. They are diastereomers of each other.
V. They are epimers of each other.

Accepted Answer

A)  I 
B)  II 
C)  I and III 
D)  II and IV 
E)  II, IV and V 
A)  I 
B)  II 
C)  I and III 
D)  II and IV 
E)  II, IV and V

Question 11

Which is the C2 epimer of D-glucose?

Accepted Answer

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

Question 12

Two D-aldopentoses give the same D-aldotetrose upon Ruff degradation. The two aldopentoses are ________.

Accepted Answer

A)  enantiomers 
B)  meso compounds 
C)  C2 epimers 
D)  C4 epimers 
E)  D-glucose and D-galactose 
A)  enantiomers 
B)  meso compounds 
C)  C2 epimers 
D)  C4 epimers 
E)  D-glucose and D-galactose

Question 13

Draw the Haworth structure of the α-pyranose form of the monosaccharide shown below.

Accepted Answer

The answer of Draw the Haworth structure of the α-pyranose...

Question 14

Provide the structure of the open-chain form of L-altrose.

Accepted Answer

The answer of Provide the structure of the open-chain form...

Question 15

Which of the following nitrogens of adenine connects to ribose to form a nucleoside?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 16

Identify the C3 epimer of the sugar below drawn in its open chain (acyclic) Fischer projection.

Accepted Answer

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

Question 17

Draw the Haworth structure of the α-furanose form of the monosaccharide shown below.

Accepted Answer

The answer of Draw the Haworth structure of the α-furanose...

Question 18

The open-chain form of D-talose is shown below. Draw the chair form of methyl β-D-talopyranoside.

Accepted Answer

The answer of The open-chain form of D-talose is shown...

Question 19

Provide the structure of the major organic product which results when D-ribose is subjected to a Ruff degradation.

Accepted Answer

The answer of Provide the structure of the major organic...

Question 20

D-Tagatose (below) is a naturally occurring sweetener that is 92% as sweet as sucrose but has only 38% of the calories. Which epimer of D-glucose undergoes keto-enol tautomerization to give D-tagatose?

Accepted Answer

The answer of D-Tagatose (below) is a naturally occurring sweetener...

Exam 23: Carbohydrates and Nucleic Acids

Show the hydrogen bonding which occurs when adenine and thymine form a base pair.

When L-erythrose is treated with NaBH4, ________.

Draw the Haworth structure of the α-furanose form of the monosaccharide shown below.

Draw the Haworth structure of the β-pyranose form of the monosaccharide shown below.

Under what conditions is the methyl glycoside of galactose prepared?

When D-(+)-allose is treated with bromine water, which of the following results?

What is the major organic product of the following reaction?

The structure of D-arabinose is shown below. Which of the following correctly describes the configurations of the asymmetric carbons in D-arabinose?

Draw the product of the following reaction in a Fischer projection.

Which of the following descriptions apply to both dihydroxyacetone and D-fructofuranose? I. They are both ketoses. II. They are both aldoses. III. They are enatiomers of each other. IV. They are diastereomers of each other. V. They are epimers of each other.

Which is the C2 epimer of D-glucose?

Two D-aldopentoses give the same D-aldotetrose upon Ruff degradation. The two aldopentoses are ________.

Draw the Haworth structure of the α-pyranose form of the monosaccharide shown below.

Provide the structure of the open-chain form of L-altrose.

Which of the following nitrogens of adenine connects to ribose to form a nucleoside?

Identify the C3 epimer of the sugar below drawn in its open chain (acyclic) Fischer projection.

Draw the Haworth structure of the α-furanose form of the monosaccharide shown below.

The open-chain form of D-talose is shown below. Draw the chair form of methyl β-D-talopyranoside.

Provide the structure of the major organic product which results when D-ribose is subjected to a Ruff degradation.

D-Tagatose (below) is a naturally occurring sweetener that is 92% as sweet as sucrose but has only 38% of the calories. Which epimer of D-glucose undergoes keto-enol tautomerization to give D-tagatose?

Structure and Bonding

Acids and Bases; Functional Groups

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides; Nucleophilic Substitution

Structure and Synthesis of Alkenes; Elimination

Reactions of Alkenes

Structure and Synthesis of Alcohols

Reactions of Alcohols

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Ethers, Epoxides, and Thioethers

Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy

Aromatic Compounds

Reactions of Aromatic Compounds

Ketones and Aldehydes

Amines

Carboxylic Acids

Carboxylic Acid Derivatives

Condensations and Alpha Substitutions of Carboxyl Compounds

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

When L-erythrose is treated with NaBH₄, ________.

Identify the C₃ epimer of the sugar below drawn in its open chain (acyclic) Fischer projection.