Question 1

You label cells with a radioactive isotope of sulfur (35S) .The only molecules that would be radioactively labeled in these cells are:

Accepted Answer

A)  Proteins
B)  Carbohydrates
C)  Nucleic acids
D)  LipidsE) B) and C)
F) C) and D)

Question 2

A double stranded DNA strand contains 26 pyrimidines.How many purines will the copied strand contain?

Accepted Answer

A)  0
B)  13
C)  26
D)  52E) None of the above
F) C) and D)

Question 3

You arrive late to a biological seminar.However, just as you enter the room, you hear the speaker referring to the "amino end" and the "carboxyl end" of a macromolecule.Immediately, you know that they are talking about a:

Accepted Answer

A)  carbohydrate.
B)  protein.
C)  lipid.
D)  DNA.E) None of the above
F) B) and C)

Question 4

Carbohydrates are composed of:

Accepted Answer

A)  amino acids.
B)  fatty acids and glycerol.
C)  nucleotides.
D)  monosaccharides.E) A) and C)
F) All of the above

Question 5

The myoglobin protein, which carries oxygen in muscle cells, has only the first three levels of protein structure.What can you infer about myoglobin?

Accepted Answer

A)  Myoglobin is made of nucleic acids
B)  Myoglobin lacks hydrogen bonds
C)  Myoglobin is made of only one polypeptide chain
D)  Myoglobin is not helical or pleatedE) A) and B)
F) A) and C)

Question 6

Vitamin D can be synthesized by the body from a derivative of cholesterol.Given this information, predict vitamin D's solubility.

Accepted Answer

A)  Vitamin D is water-soluble.
B)  Vitamin D is fat-soluble.
C)  Vitamin D is soluble in both water and fat.
D)  Vitamin D is not soluble in either water or fat.E) A) and D)
F) None of the above

Question 7

The human immunodeficiency virus (HIV)  uses RNA, rather than DNA, to encode genetic information.During infection, however, HIV uses an enzyme known as reverse transcriptase to generate double-stranded DNA.Generally speaking, how would the enzyme generate a double strand of DNA from a single strand of RNA?

Accepted Answer

A)  Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one.
B)  Reverse transcriptase first catalyzes the synthesis of a RNA copy from the viral DNA, and then catalyzes the synthesis of a second strand of DNA complementary to the first one.
C)  Reverse transcriptase first catalyzes the synthesis of a DNA copy from the viral RNA, and then catalyzes the synthesis of a second strand of DNA from the viral RNA.D) A) and B)
E) All of the above

Question 8

You have recently identified a novel protein and obtained its sequence.How could you use this sequence to predict the function of the protein?

Accepted Answer

A)  By using the sequence to make antibodies against the protein.
B)  By determining the secondary structure of the protein.
C)  By determining the DNA sequence that could encode the protein.
D)  By looking for conserved domains.E) A) and C)
F) A) and B)

Question 9

Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called:

Accepted Answer

A)  amino acids.
B)  fatty acids.
C)  enzymes.
D)  peptides.E) A) and B)
F) A) and C)

Question 10

The formula for glucose is C6H12O6.What is the formula for a polymer made by linking ten glucose molecules together by dehydration synthesis?

Accepted Answer

A)  C60H111O51
B)  C60H120O60
C)  C60H100O50
D)  C60H102O51E) A) and B)
F) C) and D)

Question 11

You recently identified a novel protein that contains several membrane-spanning domains.You would predict that the amino acids embedded in the membrane would have ____ side groups.

Accepted Answer

A)  nonpolar
B)  negatively charged
C)  polar uncharged
D)  positively chargedE) None of the above
F) A) and C) A

Question 12

Lipids are the only class of macromolecules that contain:

Accepted Answer

A)  amino acids.
B)  nucleotides.
C)  fatty acids.
D)  phosphate groups.E) All of the above
F) A) and B)

Question 13

Proteins are created with:

Accepted Answer

A)  phosphodiester bonds.
B)  peptide bonds.
C)  triglycerides.
D)  polysaccharides.E) B) and C)
F) All of the above

Question 14

A polymer with the sequence 5' ACGTACGAATAG 3' is a:

Accepted Answer

A)  polysaccharide.
B)  protein.
C)  piece of RNA.
D)  piece of DNA.E) B) and C)
F) All of the above

Question 15

Organic molecules have a carbon backbone and _____ such as -OH and -NH2 that affect their chemical properties.

Accepted Answer

A)  chemical groups
B)  R groups
C)  extension groups
D)  functional groupsE) A) and B)
F) A) and C)

Question 16

Which of the following reactions is a dehydration reaction?

Accepted Answer

A)  A + H2O  →\rightarrow→  B + C
B)  A + B + H2O  →\rightarrow→  C
C)  A  →\rightarrow→ B + C+ H2O
D)  A + B  →\rightarrow→  C + H2O E) All of the above
F) B) and C) D

Question 17

What is the difference in the bonding between alpha-helix and beta sheets?

Accepted Answer

A)  Hydrogen bonding between the amides only occurs in one of these two types of secondary structures.
B)  Hydrogen bonding occurs between the amides of adjacent chains in the sheets instead of between the amides in different parts of the helices.
C)  Sulfur bridges allow the spring like turns in alpha helices and van der Waals dispersion allows the folds in beta sheets.
D)  Hydrogen bonding always occurs in the alpha helices but only occurs in parallel beta sheets.E) A) and B)
F) A) and C)

Question 18

The simplest and the most common monosaccharide is a six-carbon sugar called:

Accepted Answer

A)  galactose.
B)  lactose.
C)  cellulose.
D)  glucose.E) A) and B)
F) None of the above

Question 19

How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?

Accepted Answer

A)  0
B)  1
C)  2
D)  3E) B) and C)
F) A) and C)

Question 20

This atom in its unbound state has four valence electrons.These electrons readily form single, double, and even triple bonds among themselves to become stable.This atom is:

Accepted Answer

A)  carbon.
B)  hydrogen.
C)  oxygen.
D)  nitrogen.E) None of the above
F) A) and B) A

Exam 3: The Chemical Building Blocks of Life

You label cells with a radioactive isotope of sulfur (³⁵S) .The only molecules that would be radioactively labeled in these cells are:

Correct Answer
verified

A double stranded DNA strand contains 26 pyrimidines.How many purines will the copied strand contain?

Correct Answer
verified

You arrive late to a biological seminar.However, just as you enter the room, you hear the speaker referring to the "amino end" and the "carboxyl end" of a macromolecule.Immediately, you know that they are talking about a:

Correct Answer
verified

Carbohydrates are composed of:

Correct Answer
verified

The myoglobin protein, which carries oxygen in muscle cells, has only the first three levels of protein structure.What can you infer about myoglobin?

Correct Answer
verified

Vitamin D can be synthesized by the body from a derivative of cholesterol.Given this information, predict vitamin D's solubility.

Correct Answer
verified

Correct Answer
verified

You have recently identified a novel protein and obtained its sequence.How could you use this sequence to predict the function of the protein?

Correct Answer
verified

Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called:

Correct Answer
verified

The formula for glucose is C₆H₁₂O₆.What is the formula for a polymer made by linking ten glucose molecules together by dehydration synthesis?

Correct Answer
verified

You recently identified a novel protein that contains several membrane-spanning domains.You would predict that the amino acids embedded in the membrane would have ____ side groups.

Correct Answer
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A

Lipids are the only class of macromolecules that contain:

Correct Answer
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Proteins are created with:

Correct Answer
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A polymer with the sequence 5' ACGTACGAATAG 3' is a:

Correct Answer
verified

Organic molecules have a carbon backbone and _____ such as -OH and -NH₂ that affect their chemical properties.

Correct Answer
verified

Which of the following reactions is a dehydration reaction?

Correct Answer
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D

What is the difference in the bonding between alpha-helix and beta sheets?

Correct Answer
verified

The simplest and the most common monosaccharide is a six-carbon sugar called:

Correct Answer
verified

How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?

Correct Answer
verified

This atom in its unbound state has four valence electrons.These electrons readily form single, double, and even triple bonds among themselves to become stable.This atom is:

Correct Answer
verified
A

Exam 3: The Chemical Building Blocks of Life

You label cells with a radioactive isotope of sulfur (35S) .The only molecules that would be radioactively labeled in these cells are:

Correct AnswerverifiedShow Answer

A double stranded DNA strand contains 26 pyrimidines.How many purines will the copied strand contain?

Correct AnswerverifiedShow Answer

You arrive late to a biological seminar.However, just as you enter the room, you hear the speaker referring to the "amino end" and the "carboxyl end" of a macromolecule.Immediately, you know that they are talking about a:

Correct AnswerverifiedShow Answer

Carbohydrates are composed of:

Correct AnswerverifiedShow Answer

The myoglobin protein, which carries oxygen in muscle cells, has only the first three levels of protein structure.What can you infer about myoglobin?

Correct AnswerverifiedShow Answer

Vitamin D can be synthesized by the body from a derivative of cholesterol.Given this information, predict vitamin D's solubility.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

You have recently identified a novel protein and obtained its sequence.How could you use this sequence to predict the function of the protein?

Correct AnswerverifiedShow Answer

Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called:

Correct AnswerverifiedShow Answer

The formula for glucose is C6H12O6.What is the formula for a polymer made by linking ten glucose molecules together by dehydration synthesis?

Correct AnswerverifiedShow Answer

You recently identified a novel protein that contains several membrane-spanning domains.You would predict that the amino acids embedded in the membrane would have ____ side groups.

Correct AnswerverifiedA

Lipids are the only class of macromolecules that contain:

Correct AnswerverifiedShow Answer

Proteins are created with:

Correct AnswerverifiedShow Answer

A polymer with the sequence 5' ACGTACGAATAG 3' is a:

Correct AnswerverifiedShow Answer

Organic molecules have a carbon backbone and _____ such as -OH and -NH2 that affect their chemical properties.

Correct AnswerverifiedShow Answer

Which of the following reactions is a dehydration reaction?

Correct AnswerverifiedD

What is the difference in the bonding between alpha-helix and beta sheets?

Correct AnswerverifiedShow Answer

The simplest and the most common monosaccharide is a six-carbon sugar called:

Correct AnswerverifiedShow Answer

How many water molecules are produced during the formation of a triglyceride from fatty acids and glycerol?

Correct AnswerverifiedShow Answer

This atom in its unbound state has four valence electrons.These electrons readily form single, double, and even triple bonds among themselves to become stable.This atom is:

Correct AnswerverifiedA

You label cells with a radioactive isotope of sulfur (³⁵S) .The only molecules that would be radioactively labeled in these cells are:

Correct Answer
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Correct Answer
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Correct Answer
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The formula for glucose is C₆H₁₂O₆.What is the formula for a polymer made by linking ten glucose molecules together by dehydration synthesis?

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
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Correct Answer
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Correct Answer
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Organic molecules have a carbon backbone and _____ such as -OH and -NH₂ that affect their chemical properties.

Correct Answer
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D

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Correct Answer
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Correct Answer
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A