Question 1

Which of the following illustrations is not a structural isomer of an organic compound with the molecular formula C6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted.

Accepted Answer

A)  6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted. 
A)     
B)     
C)     
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B)  6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted. 
A)     
B)     
C)     
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C)  6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted. 
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B)     
C)     
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D)  6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted. 
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B)     
C)     
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F) A) and B)

Question 2

Which of the functional groups is not reactive but serves as a recognisable tag on the DNA molecule and alter the expression of genes in the cells?

Accepted Answer

A)   amino
B)   methyl
C)   carboxyl
D)   hydroxylE) A) and B)
F) None of the above

Question 3

The kind and number of bonds an atom can form depends on ________.

Accepted Answer

A)   its atomic number
B)   its electron configuration
C)   its atomic mass
D)   the number of particles in its nucleusE) None of the above
F) B) and D)

Question 4

A.  −OH- \mathrm { OH }−OH 
B. 
C.  −NH2- \mathrm { NH } _ { 2 }−NH2​ 
D.  −SH- \mathrm { SH }−SH 
- Which functional group shown can pick up protons and raise the pH of the surrounding solution?

Accepted Answer

A)   A
B)   B
C)   C
D)   D E) All of the above
F) A) and B)

Question 5

Which of the pairs of molecular structures shown depict enantiomers (enantiomeric forms)  of the same molecule?

Accepted Answer

A)  
B)  
C)  
D)  E) A) and B)
F) B) and C)

Question 6

A.
B.
C.
D. 
-Which molecule can be a result of mercaptoethanol reduction of a disulphide bridge?

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) B) and C)
F) A) and B)

Question 7

Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that ________.

Accepted Answer

A)   have identical chemical formulas but differ in the branching of their carbon skeletons
B)   are mirror images of each other
C)   differ in the location of their double bonds
D)   differ in the arrangement of atoms around their double bondsE) A) and D)
F) B) and C)

Question 8

Which of the following molecules is polar?
C3H7OH C2H5COOH

Accepted Answer

A)   C3H7OH and C2H5COOH are both polar molecules.
B)   Neither C2H5COOH or C3H7OH is polar.
C)   C2H5COOH is polar, but C3H7OH is not polar.
D)   C2H5COOH is not polar, but C3H7OH is polar.E) A) and C)
F) None of the above A

Question 9

A.  −OH- \mathrm { OH }−OH 
B. 
C.  −NH2- \mathrm { NH } _ { 2 }−NH2​ 
D.  −SH- \mathrm { SH }−SH 
- Which of the functional groups shown helps stabilise proteins by forming covalent cross-links within or between protein molecules?

Accepted Answer

A)   A
B)   B
C)   C
D)   D E) B) and C)
F) A) and B)

Question 10

Which two functional groups are always found in amino acids?

Accepted Answer

A)   carbonyl and amino groups
B)   carboxyl and amino groups
C)   amino and sulfhydryl groups
D)   hydroxyl and carboxyl groupsE) A) and B)
F) All of the above

Question 11

Which action could produce a carbonyl group?

Accepted Answer

A)   the replacement of the -OH of a carboxyl group with hydrogen
B)   the addition of a thiol to a hydroxyl
C)   the addition of a hydroxyl to a phosphate
D)   the replacement of the nitrogen of an amine with oxygenE) None of the above
F) B) and C)

Question 12

Some carbon skeletons have different numbers and locations of double bonds to ________.

Accepted Answer

A)   add molecular complexity and diversity that characterise living matter
B)   be more flexible that makes the molecule stronger
C)   stay in its liquid state
D)   increase its solubility in waterE) A) and C)
F) All of the above

Question 13

A.
B.
C.
D. 
-Which molecules shown contain a carbonyl group?

Accepted Answer

A)   A and B
B)   B and C
C)   B, C and D
D)   C and DE) None of the above
F) B) and D) A

Question 14

A carbon atom is most likely to form what kind of bond(s)  with other atoms?

Accepted Answer

A)   ionic
B)   hydrogen
C)   covalent
D)   ionic bonds, covalent bonds, and hydrogen bondsE) A) and D)
F) None of the above

Question 15

Which of the following molecules is a part of ATP?

Accepted Answer

A)   adenosine
B)   cytosine
C)   guanine
D)   uracilE) A) and B)
F) A) and C) A

Question 16

Amino acids are acids because they always possess ________ as the functional group.

Accepted Answer

A)   amino
B)   carbonyl
C)   carboxyl
D)   phosphateE) B) and D)
F) B) and C)

Question 17

Choose the term that correctly describes the relationship between these two sugar molecules:

Accepted Answer

A)   structural isomers
B)   cis-trans isomers
C)   enantiomers
D)   isotopesE) C) and D)
F) A) and C)

Question 18

The experimental approach taken in current biological investigations presumes that ________.

Accepted Answer

A)   simple organic compounds can be synthesised in the laboratory from inorganic precursors, but complex organic compounds like carbohydrates and proteins can be synthesised only by living organisms
B)   a life force ultimately controls the activities of living organisms, and this life force cannot be studied by physical or chemical methods
C)   living organisms are composed of the same elements present in nonliving things, plus a few special trace elements found only in living organisms or their products
D)   living organisms can be understood in terms of the same physical and chemical laws that can be used to explain all natural phenomenaE) All of the above
F) A) and B)

Question 19

What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?

Accepted Answer

A)   the presence or absence of bonds with oxygen atoms
B)   the presence or absence of double bonds between the carbon atom and other atoms
C)   the polarity of the covalent bonds between carbon and other atoms
D)   the solvent in which the organic molecule is dissolvedE) A) and D)
F) All of the above

Question 20

Which chemical group is most likely to be responsible for an organic molecule behaving as a base?

Accepted Answer

A)   hydroxyl
B)   carbonyl
C)   amino
D)   phosphateE) C) and D)
F) A) and D)

Exam 4: Carbon and the Molecular Diversity of Life

Which of the following illustrations is not a structural isomer of an organic compound with the molecular formula C₆H₁₄? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted.

Correct Answer
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Which of the functional groups is not reactive but serves as a recognisable tag on the DNA molecule and alter the expression of genes in the cells?

Correct Answer
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The kind and number of bonds an atom can form depends on ________.

Correct Answer
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Correct Answer
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Which of the pairs of molecular structures shown depict enantiomers (enantiomeric forms) of the same molecule?

Correct Answer
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A. B. C. D. -Which molecule can be a result of mercaptoethanol reduction of a disulphide bridge?

Correct Answer
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Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that ________.

Correct Answer
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Which of the following molecules is polar? C₃H₇OH C₂H₅COOH

Correct Answer
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A

Correct Answer
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Which two functional groups are always found in amino acids?

Correct Answer
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Which action could produce a carbonyl group?

Correct Answer
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Some carbon skeletons have different numbers and locations of double bonds to ________.

Correct Answer
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A. B. C. D. -Which molecules shown contain a carbonyl group?

Correct Answer
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A

A carbon atom is most likely to form what kind of bond(s) with other atoms?

Correct Answer
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Which of the following molecules is a part of ATP?

Correct Answer
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A

Amino acids are acids because they always possess ________ as the functional group.

Correct Answer
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Choose the term that correctly describes the relationship between these two sugar molecules:

Correct Answer
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The experimental approach taken in current biological investigations presumes that ________.

Correct Answer
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What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?

Correct Answer
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Which chemical group is most likely to be responsible for an organic molecule behaving as a base?

Correct Answer
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Exam 4: Carbon and the Molecular Diversity of Life

Which of the following illustrations is not a structural isomer of an organic compound with the molecular formula C6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted.

Correct AnswerverifiedShow Answer

Which of the functional groups is not reactive but serves as a recognisable tag on the DNA molecule and alter the expression of genes in the cells?

Correct AnswerverifiedShow Answer

The kind and number of bonds an atom can form depends on ________.

Correct AnswerverifiedShow Answer

A. −OH- \mathrm { OH }−OH B. C. −NH2- \mathrm { NH } _ { 2 }−NH2​ D. −SH- \mathrm { SH }−SH - Which functional group shown can pick up protons and raise the pH of the surrounding solution?

Correct AnswerverifiedShow Answer

Which of the pairs of molecular structures shown depict enantiomers (enantiomeric forms) of the same molecule?

Correct AnswerverifiedShow Answer

A. B. C. D. -Which molecule can be a result of mercaptoethanol reduction of a disulphide bridge?

Correct AnswerverifiedShow Answer

Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that ________.

Correct AnswerverifiedShow Answer

Which of the following molecules is polar? C3H7OH C2H5COOH

Correct AnswerverifiedA

A. −OH- \mathrm { OH }−OH B. C. −NH2- \mathrm { NH } _ { 2 }−NH2​ D. −SH- \mathrm { SH }−SH - Which of the functional groups shown helps stabilise proteins by forming covalent cross-links within or between protein molecules?

Correct AnswerverifiedShow Answer

Which two functional groups are always found in amino acids?

Correct AnswerverifiedShow Answer

Which action could produce a carbonyl group?

Correct AnswerverifiedShow Answer

Some carbon skeletons have different numbers and locations of double bonds to ________.

Correct AnswerverifiedShow Answer

A. B. C. D. -Which molecules shown contain a carbonyl group?

Correct AnswerverifiedA

A carbon atom is most likely to form what kind of bond(s) with other atoms?

Correct AnswerverifiedShow Answer

Which of the following molecules is a part of ATP?

Correct AnswerverifiedA

Amino acids are acids because they always possess ________ as the functional group.

Correct AnswerverifiedShow Answer

Choose the term that correctly describes the relationship between these two sugar molecules:

Correct AnswerverifiedShow Answer

The experimental approach taken in current biological investigations presumes that ________.

Correct AnswerverifiedShow Answer

What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?

Correct AnswerverifiedShow Answer

Which chemical group is most likely to be responsible for an organic molecule behaving as a base?

Correct AnswerverifiedShow Answer

Which of the following illustrations is not a structural isomer of an organic compound with the molecular formula C₆H₁₄? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted.

Correct Answer
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Which of the following molecules is polar? C₃H₇OH C₂H₅COOH

Correct Answer
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A

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A

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A

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