Question 1

The Precambrian-Cambrian boundary is

Accepted Answer

A)   A point that separates reduction environments from oxidation environments
B)   The separation point between prokaryotes and eukaryotes
C)   A point of dramatically increased fossilization, although it is likely that many animal groups existed before this time
D)   The shift-over from plants to animal lifeE) C) and D)
F) All of the above

Question 2

If eukaryotes are more complex than prokaryotes,then why are there prokaryotes living today?

Accepted Answer

The existence of prokaryotes today, desp...

Question 3

Compare and contrast the prokaryotic and eukaryotic cellular structures.

Accepted Answer

Prokaryotic and eukaryotic cells are the...

Question 4

This chapter began with Pasteur disproving spontaneous generation,the theory that life could arise from non-living material.Then Miller and Urey test the Oparin-Haldane hypothesis and suggest that life once did arise from non-living chemicals.Are these experiments contradictory? Explain how the science community recognize both as valid.

Accepted Answer

The experiments conducted by Pasteur, Mi...

Question 5

Assumptions that the earliest life forms had to make their own food have been replaced with the belief that the earliest microorganisms were definitely primary heterotrophs.How could these earliest cells have lived if they did not make their own food,and why do we feel certain that they were not photosynthetic?

Accepted Answer

The assumption that the earliest life fo...

Question 6

The hypothesis that simple chemicals may have naturally become complex macromolecules by natural physical forces was first proposed by

Accepted Answer

A)   Stanley Miller.
B)   Graham CairnsSmith.
C)   Alexander Oparin and J.B.S. Haldane.
D)   Sidney Fox.E) A) and C)
F) All of the above

Question 7

Bacteria contain a single,large molecule of DNA in the ____________ region.

Accepted Answer

The answer of Bacteria contain a single,large molecule of DNA...

Question 8

In a protein,the folding of a polypeptide into a three-dimensional structure,usually stabilized by covalent bonds between the side groups of the amino acids,is the

Accepted Answer

A)   primary structure.
B)   secondary structure.
C)   tertiary structure.
D)   quaternary structure.E) B) and C)
F) A) and C)

Question 9

Which of the following forms of energy is NOT one of those thought to have been involved in the production of large organic molecules in the primitive reducing atmosphere?

Accepted Answer

A)   Radioactivity
B)   Electrical energy
C)   Radiation from the sun
D)   SoundE) A) and D)
F) C) and D)

Question 10

The term "reducing atmosphere" for the early earth means that the atmosphere

Accepted Answer

A)   was much thinner around the surface of the earth than now.
B)   contained only two or three kinds of gases.
C)   contained little or no free oxygen.
D)   contained little or no free nitrogen.E) A) and B)
F) A) and C)

Question 11

Water has which of the following important characteristics that explain its key role in living systems?

Accepted Answer

A)   High specific heat capacity
B)   High surface tension
C)   Is an excellent solvent
D)   All of the choices are correctE) B) and D)
F) None of the above

Question 12

A dissolved substance that has the ability to either remove or add H+ and OH- ions to resist pH changes is

Accepted Answer

A)   a solution.
B)   pure water.
C)   a buffer.
D)   a solvent.E) All of the above
F) C) and D)

Question 13

A protein is a polymer made up of which kind of monomers?

Accepted Answer

A)   Glucose or modified glucose molecules
B)   Amino acids
C)   Nucleotides
D)   Fatty acids and glycerolE) A) and B)
F) None of the above

Question 14

Most organic molecules are associated with living organisms.Which of the following statements is NOT related to the general distinctions between these types of molecules?

Accepted Answer

A)   Carbon dioxide (CO2)  lacks hydrogen atoms found in most organic molecules and therefore is usually not considered to be "organic."
B)   Formaldehyde (CH2O)  is a small molecule compared to most organic molecules but does have carbon and hydrogen covalently bonded together and therefore is considered to be "organic."
C)   Salt (Na+Cl )  is not an organic molecule but is important to the life of many organisms.
D)   Organic carbon atoms are more diverse than inorganic carbon molecules that form the molecular structure of soot or a diamond from pure carbon.
E)   All of the choices are correct.F) A) and B)
G) B) and D)

Question 15

What are the essential properties of a "protocell"?

Accepted Answer

A protocell is a self-organized, endogen...

Question 16

If an animal needs to store high-energy compounds for long-term use with the least amount of extra body weight,which would be the best molecule for storage?

Accepted Answer

A)   Fructose and glucose in the form of honey
B)   High-calorie fat molecules
C)   Starch
D)   Glycogen with extensive side branches of glucoseE) A) and B)
F) All of the above

Question 17

The splitting of one compound into two by the addition of water is called

Accepted Answer

A)   covalent.
B)   ionic formation.
C)   hydrolysis.
D)   condensation.E) A) and B)
F) A) and C)

Question 18

Which of the following lipids forms a bilayer between two fluid regions,such as in the plasma membrane of a cell?

Accepted Answer

A)   Steroids
B)   Waxes
C)   Phospholipids
D)   LipoproteinsE) All of the above
F) B) and C)

Question 19

Which of the lipid groups below is structurally unlike the others?

Accepted Answer

A)   Steroids
B)   Neutral fats
C)   Triglycerides
D)   PhospholipidsE) B) and D)
F) B) and C)

Question 20

A(n)_______________ fatty acid has two or more carbon atoms joined by double bonds.

Accepted Answer

The answer of A(n)_______________ fatty acid has two or more...

Exam 2: The Origin and Chemistry of Life

The hypothesis that simple chemicals may have naturally become complex macromolecules by natural physical forces was first proposed by

Correct Answer
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Water has which of the following important characteristics that explain its key role in living systems?

Correct Answer
verified

Which of the following lipids forms a bilayer between two fluid regions,such as in the plasma membrane of a cell?

Correct Answer
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The Precambrian-Cambrian boundary is

Correct Answer
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In a protein,the folding of a polypeptide into a three-dimensional structure,usually stabilized by covalent bonds between the side groups of the amino acids,is the

Correct Answer
verified

A protein is a polymer made up of which kind of monomers?

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The assumption that the earliest life fo...
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Which of the lipid groups below is structurally unlike the others?

Correct Answer
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Correct Answer
Answered by ExamLex AI
The experiments conducted by Pasteur, Mi...
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If an animal needs to store high-energy compounds for long-term use with the least amount of extra body weight,which would be the best molecule for storage?

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A dissolved substance that has the ability to either remove or add H⁺ and OH^- ions to resist pH changes is

Correct Answer
verified

The term "reducing atmosphere" for the early earth means that the atmosphere

Correct Answer
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Which of the following forms of energy is NOT one of those thought to have been involved in the production of large organic molecules in the primitive reducing atmosphere?

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If eukaryotes are more complex than prokaryotes,then why are there prokaryotes living today?

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Answered by ExamLex AI
The existence of prokaryotes today, desp...
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Compare and contrast the prokaryotic and eukaryotic cellular structures.

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Answered by ExamLex AI
Prokaryotic and eukaryotic cells are the...
View Answer

What are the essential properties of a "protocell"?

Correct Answer
Answered by ExamLex AI
A protocell is a self-organized, endogen...
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Bacteria contain a single,large molecule of DNA in the ____________ region.

Correct Answer
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Most organic molecules are associated with living organisms.Which of the following statements is NOT related to the general distinctions between these types of molecules?

Correct Answer
verified

The splitting of one compound into two by the addition of water is called

Correct Answer
verified

A(n)_______________ fatty acid has two or more carbon atoms joined by double bonds.

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Exam 2: The Origin and Chemistry of Life

The hypothesis that simple chemicals may have naturally become complex macromolecules by natural physical forces was first proposed by

Correct AnswerverifiedShow Answer

Water has which of the following important characteristics that explain its key role in living systems?

Correct AnswerverifiedShow Answer

Which of the following lipids forms a bilayer between two fluid regions,such as in the plasma membrane of a cell?

Correct AnswerverifiedShow Answer

The Precambrian-Cambrian boundary is

Correct AnswerverifiedShow Answer

In a protein,the folding of a polypeptide into a three-dimensional structure,usually stabilized by covalent bonds between the side groups of the amino acids,is the

Correct AnswerverifiedShow Answer

A protein is a polymer made up of which kind of monomers?

Correct AnswerverifiedShow Answer

Correct AnswerAnswered by ExamLex AIThe assumption that the earliest life fo...View AnswerShow Answer

Which of the lipid groups below is structurally unlike the others?

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Correct AnswerAnswered by ExamLex AIThe experiments conducted by Pasteur, Mi...View AnswerShow Answer

If an animal needs to store high-energy compounds for long-term use with the least amount of extra body weight,which would be the best molecule for storage?

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A dissolved substance that has the ability to either remove or add H+ and OH- ions to resist pH changes is

Correct AnswerverifiedShow Answer

The term "reducing atmosphere" for the early earth means that the atmosphere

Correct AnswerverifiedShow Answer

Which of the following forms of energy is NOT one of those thought to have been involved in the production of large organic molecules in the primitive reducing atmosphere?

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If eukaryotes are more complex than prokaryotes,then why are there prokaryotes living today?

Correct AnswerAnswered by ExamLex AIThe existence of prokaryotes today, desp...View AnswerShow Answer

Compare and contrast the prokaryotic and eukaryotic cellular structures.

Correct AnswerAnswered by ExamLex AIProkaryotic and eukaryotic cells are the...View AnswerShow Answer

What are the essential properties of a "protocell"?

Correct AnswerAnswered by ExamLex AIA protocell is a self-organized, endogen...View AnswerShow Answer

Bacteria contain a single,large molecule of DNA in the ____________ region.

Correct AnswerverifiedShow Answer

Most organic molecules are associated with living organisms.Which of the following statements is NOT related to the general distinctions between these types of molecules?

Correct AnswerverifiedShow Answer

The splitting of one compound into two by the addition of water is called

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A(n)_______________ fatty acid has two or more carbon atoms joined by double bonds.

Correct AnswerverifiedShow Answer

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Correct Answer
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Correct Answer
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Correct Answer
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The assumption that the earliest life fo...
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Correct Answer
Answered by ExamLex AI
The experiments conducted by Pasteur, Mi...
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A dissolved substance that has the ability to either remove or add H⁺ and OH^- ions to resist pH changes is

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The existence of prokaryotes today, desp...
View Answer

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Answered by ExamLex AI
Prokaryotic and eukaryotic cells are the...
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A protocell is a self-organized, endogen...
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