Question 1

What hypothesis were the scientists testing?

Accepted Answer

A)  Can organic molecules be made on Earth?
B)  Can extraterrestrial life be detected on meteorites?
C)  Can life be created from a mixture of organic molecules?
D)  What conditions existed on Earth when life first began?
E)  Were organic molecules found on meteorites extraterrestrial?F) C) and D)
G) A) and D)

Question 2

How are the monomers in proteins joined?

Accepted Answer

A)  Phosphodiester bonds between amino acids
B)  Peptide bonds between amino acids
C)  Peptide bonds between nucleotides
D)  Phosphodiester bonds between nucleotides
E)  Peptide bonds between carbohydratesF) All of the above
G) A) and B)

Question 3

In Table 2.7 why were amino acids analyzed for 15N? 15N?   A) Nitrogen is not present in nucleotides or carbohydrates B) Nitrogen is not present in nucleotides or lipids C) Nitrogen is not present in carbohydrates or lipids D) Nitrogen is not present in amino acids or carbohydrates E) Nitrogen is not present in nucleotides or amino acids" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Nitrogen is not present in nucleotides or carbohydrates
B)  Nitrogen is not present in nucleotides or lipids
C)  Nitrogen is not present in carbohydrates or lipids
D)  Nitrogen is not present in amino acids or carbohydrates
E)  Nitrogen is not present in nucleotides or amino acidsF) C) and D)
G) C) and E)

Question 4

If an atom has a valence shell that is full it:

Accepted Answer

A)  Is highly reactive
B)  Is not chemically stable
C)  Is highly likely to combine with other atoms
D)  Is not inert
E)  Is chemically stableF) A) and B)
G) All of the above

Question 5

What essential function would lipids play in the origin of life?

Accepted Answer

A)  The formation of membranes
B)  Storage of information
C)  Catalysis of reactions
D)  Formation of a cytoskeleton
E)  Anaerobic fermentationF) B) and D)
G) C) and E)

Question 6

Which of the following conclusions can be made from Table 2.7? 15N is more abundant in amino acids from the meteorite than from terrestrial samples C) Amino acids in the meteorite contain more nitrogen than amino acids from terrestrial samples D) 13C is more abundant in amino acids from the meteorite than from terrestrial samples E) Uracil is a more abundant amino acid in the meteorite than in terrestrial samples" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Glycine is a more abundant amino acid in the meteorite than in terrestrial samples
B)  15N is more abundant in amino acids from the meteorite than from terrestrial samples
C)  Amino acids in the meteorite contain more nitrogen than amino acids from terrestrial samples
D)  13C is more abundant in amino acids from the meteorite than from terrestrial samples
E)  Uracil is a more abundant amino acid in the meteorite than in terrestrial samplesF) C) and D)
G) A) and B)

Question 7

Examples of monosaccharides are:

Accepted Answer

A)  Glucose, maltose, and cellulose
B)  Glucose, lactose, and maltose
C)  Glucose, galactose, and fructose
D)  Glucose, lactose, and cellulose
E)  None of these are correctF) B) and C)
G) A) and E)

Question 8

Trees take up water hundreds of feet away by:

Accepted Answer

A)  Water's high density
B)  Cohesion
C)  Water's high boiling point
D)  Adhesion
E)  A neutral pHF) A) and E)
G) A) and D)

Question 9

The polymers with the most complex and diverse three-dimensional structure are:

Accepted Answer

A)  Saturated fats
B)  Unsaturated fats
C)  Proteins
D)  Waxes
E)  CarbohydratesF) A) and B)
G) None of the above

Question 10

Isotopes of the same element are different from one another in that:

Accepted Answer

A)  They have a different number of protons
B)  They have a different number of neutrons
C)  They have a different number of electronsD) A) and B)
E) All of the above

Question 11

The primary elements making up living organisms are:

Accepted Answer

A)  Carbon, hydrogen, oxygen, calcium, iron, and iodine
B)  Carbon, oxygen, iron, chlorine, sulfur, and phosphorous
C)  Carbon, hydrogen, iron, sulfur, sodium, and calcium
D)  Carbon, hydrogen, oxygen, sulfur, nitrogen, and phosphorous
E)  Carbon, oxygen, sulfur, calcium, iron, and phosphorousF) D) and E)
G) All of the above

Question 12

The four nitrogen bases found in RNA are:

Accepted Answer

A)  Adenine, thymine, guanine, and uracil
B)  Adenine, cytosine, guanine, and uracil
C)  Adenine, thymine, cytosine, and uracil
D)  Thymine, cytosine, guanine, and uracil
E)  None of these are correctF) All of the above
G) C) and E)

Question 13

The most common isotope of carbon is 12C.14C will have ____ than 12C.

Accepted Answer

A)  More protons
B)  More neutrons
C)  Fewer neutrons
D)  Fewer protons
E)  More electronsF) A) and E)
G) A) and B)

Question 14

A nucleotide contains which of the following?

Accepted Answer

A)  Amino acid
B)  Sugar
C)  Sugar and nitrogenous base
D)  Nitrogenous base
E)  Nitrogenous base and amino acidF) A) and E)
G) A) and D)

Question 15

14C and 14N are both:

Accepted Answer

A)  Atoms
B)  Molecules
C)  Compounds
D)  Polymers
E)  IonsF) B) and D)
G) A) and B)

Question 16

A substance having a pH of 6 would best be described as:

Accepted Answer

A)  A weak acid
B)  Neutral
C)  A weak base
D)  A strong acid
E)  A strong baseF) B) and E)
G) A) and C)

Question 17

Cohesion is a property of water in which water molecules tend to stick together.

Accepted Answer

A) True 
 B)False

Question 18

In the example of ionic bond formation between sodium and chlorine:

Accepted Answer

A)  Na is the chemical symbol for chlorine
B)  Sodium accepts an electron
C)  Chlorine accepts an electron
D)  Chlorine becomes positively charged
E)  Both sodium accepts an electron and chlorine becomes positively charged are correctF) A) and D)
G) A) and C)

Question 19

A substance having a pH of 13 would best be described as:

Accepted Answer

A)  A weak acid
B)  A weak base
C)  Neutral
D)  A strong acid
E)  A strong baseF) B) and E)
G) A) and C)

Question 20

Evaporation is:

Accepted Answer

A)  The conversion of a liquid into a vapor
B)  The conversion of a solid into a vapor
C)  The conversion of a vapor into a liquid
D)  The conversion of a vapor into a solid
E)  All are correctF) C) and D)
G) A) and B)

Exam 2: The Chemistry of Life

If an atom has a valence shell that is full it:

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Examples of monosaccharides are:

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Evaporation is:

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The most common isotope of carbon is 12C.14C will have ____ than 12C.

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In Table 2.7 why were amino acids analyzed for 15N?

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The primary elements making up living organisms are:

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Isotopes of the same element are different from one another in that:

Correct AnswerverifiedShow Answer

The polymers with the most complex and diverse three-dimensional structure are:

Correct AnswerverifiedShow Answer

A substance having a pH of 6 would best be described as:

Correct AnswerverifiedShow Answer

What essential function would lipids play in the origin of life?

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The four nitrogen bases found in RNA are:

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14C and 14N are both:

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What hypothesis were the scientists testing?

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How are the monomers in proteins joined?

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Cohesion is a property of water in which water molecules tend to stick together.

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Which of the following conclusions can be made from Table 2.7?

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Trees take up water hundreds of feet away by:

Correct AnswerverifiedShow Answer

In the example of ionic bond formation between sodium and chlorine:

Correct AnswerverifiedShow Answer

A substance having a pH of 13 would best be described as:

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A nucleotide contains which of the following?

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The most common isotope of carbon is ¹²C.¹⁴C will have ____ than ¹²C.

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In Table 2.7 why were amino acids analyzed for ¹⁵N?

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¹⁴C and ¹⁴N are both:

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