Question 1

Two enantiomers typically have the same biological activity.

Accepted Answer

A) True 
 B)False

Question 2

Consider the stereoisomers (A-E) drawn below:  Which structure(s) is/are diastereomers of structure E?

Accepted Answer

A)  Structure A
B)  Structure B
C)  Structure C
D)  Structure D
E)  Structures A and B

Question 3

For an odor to be perceived,a molecule must bind to an olfactory receptor,resulting in a nerve impulse that travels to the brain.

Accepted Answer

A) True 
 B)False

Question 4

A compound that does not change the direction of plane-polarized light is called

Accepted Answer

A)  Chiral
B)  Diastereomer
C)  Achiral
D)  Neutral
E)  Acidic

Question 5

If a stereoisomer has an enantiomer,it does not have a diastereomer.

Accepted Answer

A) True 
 B)False

Question 6

In organic molecules,oxygen atoms cannot be chirality centers.

Accepted Answer

A) True 
 B)False

Question 7

Two enantiomers rotate plane-polarized light ________.

Accepted Answer

A)  to an equal extent but in opposite directions
B)  to an equal extent in the same direction
C)  to vastly differing extents in random directions
D)  exactly 90º clockwise

Question 8

A nail is an example of a chiral object.

Accepted Answer

A) True 
 B)False

Question 9

Which molecule is not an enantiomer of the molecule whose structure is shown below?

Accepted Answer

A)   
B)   
C)   
D)  All the molecules are enantiomers of the original structure.

Question 10

The amino acid alanine found in the proteins of the body has a melting point of 297 °C and a specific rotation of +8.5. The enantiomer of alanine would have a melting point of -297 °C and a specific rotation of -8.5.

Accepted Answer

A) True 
 B)False

Question 11

Any molecule with one chirality center is a chiral compound.

Accepted Answer

A) True 
 B)False

Question 12

If one enantiomer causes plane-polarized light to rotate counterclockwise,that enantiomer is labeled as the (-)-enantiomer.

Accepted Answer

A) True 
 B)False

Question 13

Which statement concerning stereochemistry is incorrect?

Accepted Answer

A)  An object or molecule is chiral if it is nonsuperimposable on its mirror image.
B)  A chiral molecule is optically active and rotates plane polarized light either clockwise or counterclockwise.
C)  Enantiomers are superimposable mirror image isomers.
D)  Diastereomers are stereoisomers that are not related as mirror images.

Question 14

The Fischer projection to the right represents the compound to the left.

Accepted Answer

A) True 
 B)False

Question 15

The dipeptide molecule shown below contains two chirality centers.

Accepted Answer

A) True 
 B)False

Question 16

Which structure represents the three-dimensional structure of the Fischer projection shown?

Accepted Answer

A)   
B)   
C)   
D)

Question 17

Which choice is the enantiomer of the molecule given below?

Accepted Answer

A)   
B)   
C)   
D)  None of these molecules is an enantiomer of the original molecule.

Question 18

Alanine,shown below,is a naturally occurring chiral amino acid. Which pair represents the two enantiomers of alanine?

Accepted Answer

A)   
B)   
C)

Question 19

How can the following molecules be classified correctly?

Accepted Answer

A)  II and III are identical molecules
B)  I and II are constitutional isomers
C)  I and III are stereoisomers
D)  II and III are stereoisomers
E)  Both statements B and D are correct

Question 20

A carbonyl carbon is a common example of a chirality center.

Accepted Answer

A) True 
 B)False

Exam 15: The Three-Dimensional Shape of Molecules

For an odor to be perceived,a molecule must bind to an olfactory receptor,resulting in a nerve impulse that travels to the brain.

Correct AnswerverifiedShow Answer

Consider the stereoisomers (A-E) drawn below: Which structure(s) is/are diastereomers of structure E?

Correct AnswerverifiedShow Answer

If one enantiomer causes plane-polarized light to rotate counterclockwise,that enantiomer is labeled as the (-)-enantiomer.

Correct AnswerverifiedShow Answer

The amino acid alanine found in the proteins of the body has a melting point of 297 °C and a specific rotation of +8.5. The enantiomer of alanine would have a melting point of -297 °C and a specific rotation of -8.5.

Correct AnswerverifiedShow Answer

The dipeptide molecule shown below contains two chirality centers.

Correct AnswerverifiedShow Answer

Which molecule is not an enantiomer of the molecule whose structure is shown below?

Correct AnswerverifiedShow Answer

Two enantiomers rotate plane-polarized light ________.

Correct AnswerverifiedShow Answer

Alanine,shown below,is a naturally occurring chiral amino acid. Which pair represents the two enantiomers of alanine?

Correct AnswerverifiedShow Answer

If a stereoisomer has an enantiomer,it does not have a diastereomer.

Correct AnswerverifiedShow Answer

Which choice is the enantiomer of the molecule given below?

Correct AnswerverifiedShow Answer

A carbonyl carbon is a common example of a chirality center.

Correct AnswerverifiedShow Answer

The Fischer projection to the right represents the compound to the left.

Correct AnswerverifiedShow Answer

A compound that does not change the direction of plane-polarized light is called

Correct AnswerverifiedShow Answer

A nail is an example of a chiral object.

Correct AnswerverifiedShow Answer

Any molecule with one chirality center is a chiral compound.

Correct AnswerverifiedShow Answer

Which structure represents the three-dimensional structure of the Fischer projection shown?

Correct AnswerverifiedShow Answer

How can the following molecules be classified correctly?

Correct AnswerverifiedShow Answer

In organic molecules,oxygen atoms cannot be chirality centers.

Correct AnswerverifiedShow Answer

Which statement concerning stereochemistry is incorrect?

Correct AnswerverifiedShow Answer

Two enantiomers typically have the same biological activity.

Correct AnswerverifiedShow Answer

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