Question 1

Name the two purine bases which serve as components in ribonucleosides.

Accepted Answer

The answer of Name the two purine bases which serve...

Question 2

Six-membered cyclic hemiacetals and five-membered cyclic hemiacetals are called, respectively, ________.

Accepted Answer

A)   mannoses and xyloses
B)   maltoses and arabinoses
C)   pyranoses and furanoses
D)   glyoses and fructoses
E)   none of the aboveF) A) and E)
G) B) and D)

Question 3

L-Ribulose may be classified as ________.

Accepted Answer

A)   an aldotetrose
B)   an aldopentose
C)   an aldohexose
D)   a ketotetrose
E)   a ketopentoseF) A) and B)
G) A) and D)

Question 4

Will methyl-β-D-talopyranoside undergo mutarotation? Why or why not?

Accepted Answer

No, because there is...

Question 5

A D-aldopentose is subjected to Kiliani-Fischer chain lengthening and the resulting mixture is oxidized using nitric acid. The two distinct products both show optical activity. From this one can conclude that the original D-aldopentose ________.

Accepted Answer

A)   must be D-ribose
B)   is either D-ribose or D-arabinose
C)   must be D-xylose
D)   is either D-xylose or D-arabinose
E)   must be D-lyxoseF) A) and E)
G) B) and E)

Question 6

Given the structure of D-altrose below, draw the structure of L-altrose.

Accepted Answer

The answer of Given the structure of D-altrose below, draw...

Question 7

Draw the Haworth structure of α-D-glucopyranose.

Accepted Answer

The answer of Draw the Haworth structure of α-D-glucopyranose....

Question 8

The α and β anomers of a D-glucopyranose are related as ________.

Accepted Answer

A)   enantiomers
B)   meso compounds
C)   structural isomers
D)   epimers
E)   disaccharidesF) B) and E)
G) A) and B)

Question 9

In a Haworth projection of a five-membered cyclic hemiacetal, ________.

Accepted Answer

A)   the C6 carbon is drawn on the right
B)   the C2 carbon is drawn on the left
C)   the ring oxygen is drawn in the front
D)   the ring oxygen is drawn in the back
E)   all hydroxyls are always on the same side of the moleculeF) A) and E)
G) B) and E)

Question 10

What is the major organic product of the following reaction?

Accepted Answer

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

Question 11

Draw the Haworth structure of β-D-glucopyranose.

Accepted Answer

The answer of Draw the Haworth structure of β-D-glucopyranose....

Question 12

When a monosaccharide reacts to give the pyranose form from its open-chain form, how many distinct pyranose forms are possible?

Accepted Answer

A)   1
B)   2
C)   2n, where n is the number of carbons present
D)   4n + 2, where n is the number of carbons present
E)   4F) C) and D)
G) A) and E)

Question 13

When L-(+) -lyxose is treated with nitric acid, 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 acidF) A) and C)
G) D) and E)

Question 14

What are the four common ribonucleosides?

Accepted Answer

cytidine, ...

Question 15

An optically active D-aldopentose produced an optically inactive alditol upon treatment with NaBH4. When this aldopentose was subjected to a Ruff degradation, a D-aldotetrose was generated. This aldotetrose gave an optically active aldaric acid upon oxidation with HNO3. Use these data to provide the structure of the starting D-aldopentose.

Accepted Answer

Question 16

Provide the structure of the major organic product which results when methyl β-D-glucopyranoside is treated with excess acetic anhydride in pyridine.

Accepted Answer

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

Question 17

Compound A (C4H8O4) gives a positive test with Tollen's reagent. Treatment of A with bromine water produces an optically active compound B. Oxidation of A with nitric acid gives an optically inactive compound C. Compound A can be prepared from L-glyceraldehyde by a Kiliani-Fischer synthesis. What are the structures of A, B, and C?

Accepted Answer

Question 18

When D-(+) -xylose is treated with nitric acid, 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 acidF) A) and E)
G) B) and C)

Question 19

Which of the following represents a pair of epimers?

Accepted Answer

A)   D- and L-erythrose
B)   D-erythrose and D-threose
C)   D-arabinose and D-erythrose
D)   D-arabinose and D-xylose
E)   D-glyceraldehyde and D-threoseF) All of the above
G) B) and C)

Question 20

Provide the structure of deoxythymidine.

Accepted Answer

The answer of Provide the structure of deoxythymidine....

Exam 23: Carbohydrates and Nucleic Acids

Given the structure of D-altrose below, draw the structure of L-altrose.

Correct Answer
verified

Provide the structure of the major organic product which results when methyl β-D-glucopyranoside is treated with excess acetic anhydride in pyridine.

Correct Answer
verified

When D-(+) -xylose is treated with nitric acid, which of the following results?

Correct Answer
verified

Provide the structure of deoxythymidine.

Correct Answer
verified

L-Ribulose may be classified as ________.

Correct Answer
verified

Draw the Haworth structure of β-D-glucopyranose.

Correct Answer
verified

Six-membered cyclic hemiacetals and five-membered cyclic hemiacetals are called, respectively, ________.

Correct Answer
verified

In a Haworth projection of a five-membered cyclic hemiacetal, ________.

Correct Answer
verified

Will methyl-β-D-talopyranoside undergo mutarotation? Why or why not?

Correct Answer
verified
No, because there is...
View Answer

When a monosaccharide reacts to give the pyranose form from its open-chain form, how many distinct pyranose forms are possible?

Correct Answer
verified

What is the major organic product of the following reaction?

Correct Answer
verified

Name the two purine bases which serve as components in ribonucleosides.

Correct Answer
verified

Which of the following represents a pair of epimers?

Correct Answer
verified

The α and β anomers of a D-glucopyranose are related as ________.

Correct Answer
verified

Draw the Haworth structure of α-D-glucopyranose.

Correct Answer
verified

Correct Answer
verified

When L-(+) -lyxose is treated with nitric acid, which of the following results?

Correct Answer
verified

Correct Answer
verified

A D-aldopentose is subjected to Kiliani-Fischer chain lengthening and the resulting mixture is oxidized using nitric acid. The two distinct products both show optical activity. From this one can conclude that the original D-aldopentose ________.

Correct Answer
verified

What are the four common ribonucleosides?

Correct Answer
verified
cytidine, ...
View Answer

Exam 23: Carbohydrates and Nucleic Acids

Given the structure of D-altrose below, draw the structure of L-altrose.

Correct AnswerverifiedShow Answer

Provide the structure of the major organic product which results when methyl β-D-glucopyranoside is treated with excess acetic anhydride in pyridine.

Correct AnswerverifiedShow Answer

When D-(+) -xylose is treated with nitric acid, which of the following results?

Correct AnswerverifiedShow Answer

Provide the structure of deoxythymidine.

Correct AnswerverifiedShow Answer

L-Ribulose may be classified as ________.

Correct AnswerverifiedShow Answer

Draw the Haworth structure of β-D-glucopyranose.

Correct AnswerverifiedShow Answer

Six-membered cyclic hemiacetals and five-membered cyclic hemiacetals are called, respectively, ________.

Correct AnswerverifiedShow Answer

In a Haworth projection of a five-membered cyclic hemiacetal, ________.

Correct AnswerverifiedShow Answer

Will methyl-β-D-talopyranoside undergo mutarotation? Why or why not?

Correct AnswerverifiedNo, because there is...View AnswerShow Answer

When a monosaccharide reacts to give the pyranose form from its open-chain form, how many distinct pyranose forms are possible?

Correct AnswerverifiedShow Answer

What is the major organic product of the following reaction?

Correct AnswerverifiedShow Answer

Name the two purine bases which serve as components in ribonucleosides.

Correct AnswerverifiedShow Answer

Which of the following represents a pair of epimers?

Correct AnswerverifiedShow Answer

The α and β anomers of a D-glucopyranose are related as ________.

Correct AnswerverifiedShow Answer

Draw the Haworth structure of α-D-glucopyranose.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When L-(+) -lyxose is treated with nitric acid, which of the following results?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A D-aldopentose is subjected to Kiliani-Fischer chain lengthening and the resulting mixture is oxidized using nitric acid. The two distinct products both show optical activity. From this one can conclude that the original D-aldopentose ________.

Correct AnswerverifiedShow Answer

What are the four common ribonucleosides?

Correct Answerverifiedcytidine, ...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
No, because there is...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
cytidine, ...
View Answer