Question 1

The element present in all organic molecules is

Accepted Answer

A)   hydrogen.
B)   oxygen.
C)   carbon.
D)   nitrogen.
E)   phosphorus.

Question 2

Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified?

Accepted Answer

A)   as a pentose
B)   as a hexose
C)   as a monosaccharide
D)   as a disaccharide
E)   as a polysaccharide

Question 3

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 presence or absence of bonds with nitrogen atoms
E)   the solvent that the organic molecule is dissolved in

Question 4

Which of the following categories includes all others in the list?

Accepted Answer

A)   monosaccharide
B)   disaccharide
C)   starch
D)   carbohydrate
E)   polysaccharide

Question 5

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 6

A molecule with the chemical formula C6H12O6 is probably a

Accepted Answer

A)   carbohydrate.
B)   lipid.
C)   monosaccharide
D)   carbohydrate and lipid only.
E)   carbohydrate and monosaccharide only.

Question 7

The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are the α form. Which of the following could amylase break down?

Accepted Answer

A)   starch
B)   cellulose
C)   chitin
D)   starch and chitin only
E)   starch, cellulose, and chitin

Question 8

Which of the following is not a monomer/polymer pairing?

Accepted Answer

A)   monosaccharide/polysaccharide
B)   amino acid/protein
C)   triglyceride/phospholipid bilayer
D)   deoxyribonucleotide/DNA
E)   ribonucleotide/RNA

Question 9

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 10

Figure 3.3
-Which of the structures illustrated in Figure 3.3 is an impossible covalently bonded molecule?

Accepted Answer

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

Question 11

Figure 3.6
-Which molecule shown in Figure 3.6 can form a cross linkage?

Accepted Answer

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

Question 12

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

Accepted Answer

A)   phospholipids
B)   nucleic acids
C)   proteins
D)   amylose
E)   both phospholipids and nucleic acids

Question 13

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 one another.
C)   exist in either linear chain or ring forms.
D)   differ in the location of their double bonds.
E)   differ in the arrangement of atoms around their double bonds.

Question 14

Which of the following best summarizes the relationship between dehydration reactions and hydrolysis?

Accepted Answer

A)   Dehydration reactions assemble polymers, and hydrolysis reactions break down polymers.
B)   Dehydration reactions eliminate water from lipid membranes, and hydrolysis makes lipid membranes water permeable.
C)   Dehydration reactions can occur only after hydrolysis.
D)   Hydrolysis creates monomers, and dehydration reactions break down polymers.
E)   Dehydration reactions ionize water molecules and add hydroxyl groups to polymers; hydrolysis reactions release hydroxyl groups from polymers.

Question 15

If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?

Accepted Answer

A)   10
B)   20
C)   40
D)   80
E)   impossible to tell from the information given

Question 16

Which level of protein structure do the α helix and the β pleated sheet represent?

Accepted Answer

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

Question 17

Figure 3.4
-Which of the groups in Figure 3.4 is an acidic functional group that can dissociate and release H+ into a solution?

Accepted Answer

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

Question 18

If cells are grown in a medium containing radioactive 35S, which of these molecules will be labeled?

Accepted Answer

A)   phospholipids
B)   nucleic acids
C)   proteins
D)   amylose
E)   both proteins and nucleic acids

Question 19

Figure 3.5
-Which molecule shown in Figure 3.5 has a carbonyl functional group in the form of an aldehyde?

Accepted Answer

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

Question 20

Figure 3.5
-Which molecule shown in Figure 3.5 has a carbonyl functional group in the form of a ketone?

Accepted Answer

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

Exam 3: Carbon and the Molecular Diversity of Life

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

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Which of the following is not a monomer/polymer pairing?

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The element present in all organic molecules is

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

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Figure 3.3 -Which of the structures illustrated in Figure 3.3 is an impossible covalently bonded molecule?

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Figure 3.6 -Which molecule shown in Figure 3.6 can form a cross linkage?

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Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified?

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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?

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If cells are grown in a medium containing radioactive 35S, which of these molecules will be labeled?

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A molecule with the chemical formula C6H12O6 is probably a

Correct AnswerverifiedShow Answer

Figure 3.5 -Which molecule shown in Figure 3.5 has a carbonyl functional group in the form of a ketone?

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If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?

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Which of the following categories includes all others in the list?

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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 an acidic functional group that can dissociate and release H+ into a solution?

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Figure 3.5 -Which molecule shown in Figure 3.5 has a carbonyl functional group in the form of an aldehyde?

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Which of the following best summarizes the relationship between dehydration reactions and hydrolysis?

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Which level of protein structure do the α helix and the β pleated sheet represent?

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The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are the α form. Which of the following could amylase break down?

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

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