Question 1

How many electron pairs does carbon share in order to complete its valence shell?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  8

Question 2

A carbon atom is most likely to form which of the following bonds with other atoms?

Accepted Answer

A)  ionic bonds
B)  hydrogen bonds
C)  covalent bonds
D)  covalent bonds and hydrogen bonds

Question 3

Figure 3.11
Which of the following statements regarding the chemical reaction illustrated in Figure 3.11 is true?

Accepted Answer

A)  It is a hydrolysis reaction.
B)  It results in a peptide bond.
C)  It forms a disaccharide.
D)  It forms two amino acids.

Question 4

Figure 3.7
-If two of the molecules shown in Figure 3.7 are linked together,carbon-1 of one molecule to carbon-4 of the other,the bond that is formed would be found in which of the following polymers?

Accepted Answer

A)  cellulose
B)  glycogen
C)  chitin
D)  polypeptide
E)  nucleic acid

Question 5

A nutritional supplement developed for athletes is shown to contain only carbon,hydrogen,and oxygen.Based on these data,you may safely conclude that

Accepted Answer

A)  the food may contain carbohydrates and protein.
B)  the food may contain carbohydrates and nucleic acids.
C)  the food may contain lipids and protein.
D)  the food may contain carbohydrates and lipids but not protein.

Question 6

Bonds formed between the side chains (R groups) in a polypeptide are most important in stabilizing which of the following?

Accepted Answer

A)  primary structure
B)  secondary structure
C)  tertiary structure
D)  quaternary structure

Question 7

When two carbon atoms are joined by a double bond,the carbons and atoms bound to them form which of the following structures?

Accepted Answer

A)  sphere
B)  cube
C)  tetrahedron
D)  line
E)  plane.

Question 8

Which of the following will be most soluble in water?

Accepted Answer

A)  organic hydrocarbons
B)  organic hydrocarbons with hydroxyl groups attached
C)  organic hydrocarbons with sulfhydryl groups attached
D)  organic hydrocarbons with methyl groups attached

Question 9

The molecular formula for glucose is C6H12O6.What would be the molecular formula for a polymer made by linking 10 glucose molecules together by dehydration reactions?

Accepted Answer

A)  C60H120O60
B)  C60H102O51
C)  C60H100O50
D)  C60H111O51

Question 10

If cells are grown in a medium containing radioactive 32P,which of these molecules will be radioactively labeled?

Accepted Answer

A)  triacylglycerols
B)  nucleic acids
C)  fatty acids
D)  starch

Question 11

Figure 3.9
-Which of the following statements regarding the molecule illustrated in Figure 3.9 is true?

Accepted Answer

A)  It is a saturated fatty acid.
B)  It is an entirely nonpolar molecule.
C)  Molecules of this type are usually liquid at room temperature.
D)  It is highly soluble in water.

Question 12

Which of the following polymers lacks nitrogen?

Accepted Answer

A)  protein
B)  RNA
C)  glycogen
D)  chitin

Question 13

Which of the following classes of biological molecules consist of both small molecule monomers and macromolecular polymers?

Accepted Answer

A)  lipids
B)  carbohydrates
C)  proteins
D)  nucleic acids

Question 14

The α helix and β pleated sheet are examples of which level of protein structure?

Accepted Answer

A)  primary
B)  secondary
C)  tertiary
D)  quaternary
E)  primary and tertiary

Question 15

Which of the following statements concerning unsaturated fats is true?

Accepted Answer

A)  They are more common in animals than in plants.
B)  They have double bonds in their fatty acid chains.
C)  They generally solidify at room temperature.
D)  They contain more hydrogen than do saturated fats having the same number of carbon atoms.

Question 16

Figure 3.3
-Which of the structures illustrated in Figure 3.3 contain(s) only nonpolar single covalent bonds?

Accepted Answer

A)  A only
B)  B only
C)  B and C
D)  B and D
E)  B and E

Question 17

Figure 3.12
-At which bond in Figure 3.12 would water need to be added to achieve hydrolysis of the dipeptide resulting in production of its component amino acids?

Accepted Answer

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

Question 18

Figure 3.5
-Which molecule shown in Figure 3.5 contains a carboxyl group?

Accepted Answer

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

Question 19

+ ions and become positively charged? A) A B) B C) C D) D E) E" class="answers-bank-image d-inline" rel="preload" > Figure 3.4
-Which of the groups in Figure 3.4 is a basic functional group that can accept H+ ions and become positively charged?

Accepted Answer

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

Question 20

Figure 3.6
-Which molecule shown in Figure 3.6 can form a covalent bond between side chains (R groups) in a polypeptide?

Accepted Answer

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

Exam 3: Carbon and the Molecular Diversity of Life

When two carbon atoms are joined by a double bond,the carbons and atoms bound to them form which of the following structures?

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Figure 3.12 -At which bond in Figure 3.12 would water need to be added to achieve hydrolysis of the dipeptide resulting in production of its component amino acids?

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Figure 3.11 Which of the following statements regarding the chemical reaction illustrated in Figure 3.11 is true?

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Figure 3.7 -If two of the molecules shown in Figure 3.7 are linked together,carbon-1 of one molecule to carbon-4 of the other,the bond that is formed would be found in which of the following polymers?

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Which of the following polymers lacks nitrogen?

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If cells are grown in a medium containing radioactive 32P,which of these molecules will be radioactively labeled?

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Which of the following will be most soluble in water?

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Figure 3.9 -Which of the following statements regarding the molecule illustrated in Figure 3.9 is true?

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Which of the following statements concerning unsaturated fats is true?

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The molecular formula for glucose is C6H12O6.What would be the molecular formula for a polymer made by linking 10 glucose molecules together by dehydration reactions?

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Figure 3.6 -Which molecule shown in Figure 3.6 can form a covalent bond between side chains (R groups) in a polypeptide?

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Bonds formed between the side chains (R groups) in a polypeptide are most important in stabilizing which of the following?

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Which of the following classes of biological molecules consist of both small molecule monomers and macromolecular polymers?

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How many electron pairs does carbon share in order to complete its valence shell?

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Figure 3.4 -Which of the groups in Figure 3.4 is a basic functional group that can accept H+ ions and become positively charged?

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Figure 3.3 -Which of the structures illustrated in Figure 3.3 contain(s) only nonpolar single covalent bonds?

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Figure 3.5 -Which molecule shown in Figure 3.5 contains a carboxyl group?

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A nutritional supplement developed for athletes is shown to contain only carbon,hydrogen,and oxygen.Based on these data,you may safely conclude that

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The α helix and β pleated sheet are examples of which level of protein structure?

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A carbon atom is most likely to form which of the following bonds with other atoms?

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If cells are grown in a medium containing radioactive ³²P,which of these molecules will be radioactively labeled?

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The molecular formula for glucose is C₆H₁₂O₆.What would be the molecular formula for a polymer made by linking 10 glucose molecules together by dehydration reactions?

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Figure 3.4 -Which of the groups in Figure 3.4 is a basic functional group that can accept H⁺ ions and become positively charged?

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