Question 1

A critical answer to the chicken-or-the-egg problem formed by the nucleic-acid-or-enzyme-first dilemma is potentially solved by the discovery of catalytic RNAs called _______________.

Accepted Answer

The answer of A critical answer to the chicken-or-the-egg problem...

Question 2

Nucleic acids are important because they

Accepted Answer

A)  act as buffers.
B)  are the basic units of neutral fats.
C)  direct the synthesis of proteins.
D)  None of the choices is correct.E) None of the above
F) A) and B)

Question 3

A peptide bond is found in which type of biological molecule?

Accepted Answer

A)  Carbohydrate
B)  Lipid
C)  Protein
D)  Simple sugarE) A) and B)
F) B) and D)

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 the organic compounds required for life could be formed from the simpler molecules present in the prebiotic environment.Are these experiments contradictory? Explain how the science community recognize both as valid.

Accepted Answer

No, these experiments are not contradict...

Question 5

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) All of the above
G) A) and C)

Question 6

An alternative environment to the "hot dilute soup" that offers a possible source of energy and molecules for the origin of life is/are the

Accepted Answer

A)  frozen Antarctic ice sheets.
B)  surface of Mars.
C)  hydrothermal vents in ocean bottoms.
D)  Earth mantle and core.E) A) and C)
F) C) and D)

Question 7

Describe the first evidence for chemical evolution that came from Stanley Miller's experiment.

Accepted Answer

The first evidence for chemical evolutio...

Question 8

The ______________ theory proposes that pre-eukaryotes are the result of anaerobic bacteria ingesting aerobic bacteria and subsequently a symbiotic relationship was formed.

Accepted Answer

The answer of The ______________ theory proposes that pre-eukaryotes are...

Question 9

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) B) and C)
F) B) and D)

Question 10

Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Accepted Answer

A)  Water vapor (H2O) 
B)  Carbon dioxide (CO2) 
C)  Oxygen (O2) 
D)  Nitrogen (N2) E) A) and B)
F) A) and C)

Question 11

A dehydration synthesis reaction is also

Accepted Answer

A)  a condensation reaction.
B)  a hydrolysis reaction.
C)  an isomeric reaction.
D)  a reaction that does not require enzymes.E) B) and C)
F) All of the above

Question 12

Biological evolution differs from chemical evolution in that biological evolution would have been possible only after the development of

Accepted Answer

A)  true cells capable of replication.
B)  nucleic acids.
C)  enzymes.
D)  a metabolic pathway.E) B) and C)
F) A) and D)

Question 13

Describe the chicken-or-the-egg dilemma with enzymes and hereditary molecules,and detail how the "RNA world" proposal offers a solution.

Accepted Answer

The chicken-or-the-egg dilemma in the co...

Question 14

A solution that has a pH of 5 has

Accepted Answer

A)  a concentration of H+ 20 times higher than water.
B)  a concentration of H+ 100 times higher than water.
C)  a concentration of H+ the same as water.
D)  a concentration of H+ 20 times lower than water.
E)  a concentration of H+ 100 times lower than water.F) A) and B)
G) A) and C)

Question 15

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) C) and D)
F) A) and D)

Question 16

Cholesterol belongs to which of the following groups?

Accepted Answer

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

Question 17

Which of the following carbohydrates is used in animal muscle and liver cells for energy storage?

Accepted Answer

A)  Starch
B)  Chitin
C)  Cellulose
D)  GlycogenE) B) and C)
F) A) and D)

Question 18

You eat eggs for breakfast and return in the evening to dirty dishes with "dried on" yellow streaks.After soaking awhile,the egg yolk protein molecules easily "wash off." What happened?

Accepted Answer

A)  Heating denatured the egg protein molecules,hydrolysis reactions then formed bonds in the dried egg yolk,and soaking in water eventually resulted in condensation reactions where water broke these bonds
B)  Heating denatured the egg protein molecules,unorganized condensation reactions formed bonds in the drying egg,and soaking in water resulted in hydrolysis reactions where water broke these bonds
C)  Egg monomers were fused to become one polymer,which was easily dissolved by water back into monomers
D)  Addition of water converted organic molecules into inorganic moleculesE) None of the above
F) B) and C)

Question 19

Which of the following is the most abundant carbohydrate in the world?

Accepted Answer

A)  Cellulose
B)  Glycogen
C)  Fructose
D)  GlucoseE) A) and B)
F) A) and C)

Question 20

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) A) and C)

Exam 2: The Origin and Chemistry of Life

An alternative environment to the "hot dilute soup" that offers a possible source of energy and molecules for the origin of life is/are the

Correct Answer
verified

You eat eggs for breakfast and return in the evening to dirty dishes with "dried on" yellow streaks.After soaking awhile,the egg yolk protein molecules easily "wash off." What happened?

Correct Answer
verified

Which of the following is the most abundant carbohydrate in the world?

Correct Answer
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Nucleic acids are important because they

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
No, these experiments are not contradict...
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Biological evolution differs from chemical evolution in that biological evolution would have been possible only after the development of

Correct Answer
verified

A dehydration synthesis reaction is also

Correct Answer
verified

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

Correct Answer
verified

Describe the chicken-or-the-egg dilemma with enzymes and hereditary molecules,and detail how the "RNA world" proposal offers a solution.

Correct Answer
Answered by ExamLex AI
The chicken-or-the-egg dilemma in the co...
View 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 Answer
verified

A solution that has a pH of 5 has

Correct Answer
verified

Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Correct Answer
verified

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?

Correct Answer
verified

Describe the first evidence for chemical evolution that came from Stanley Miller's experiment.

Correct Answer
Answered by ExamLex AI
The first evidence for chemical evolutio...
View Answer

A peptide bond is found in which type of biological molecule?

Correct Answer
verified

The ______________ theory proposes that pre-eukaryotes are the result of anaerobic bacteria ingesting aerobic bacteria and subsequently a symbiotic relationship was formed.

Correct Answer
verified

Cholesterol belongs to which of the following groups?

Correct Answer
verified

Which of the following carbohydrates is used in animal muscle and liver cells for energy storage?

Correct Answer
verified

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 critical answer to the chicken-or-the-egg problem formed by the nucleic-acid-or-enzyme-first dilemma is potentially solved by the discovery of catalytic RNAs called _______________.

Correct Answer
verified

Exam 2: The Origin and Chemistry of Life

An alternative environment to the "hot dilute soup" that offers a possible source of energy and molecules for the origin of life is/are the

Correct AnswerverifiedShow Answer

You eat eggs for breakfast and return in the evening to dirty dishes with "dried on" yellow streaks.After soaking awhile,the egg yolk protein molecules easily "wash off." What happened?

Correct AnswerverifiedShow Answer

Which of the following is the most abundant carbohydrate in the world?

Correct AnswerverifiedShow Answer

Nucleic acids are important because they

Correct AnswerverifiedShow Answer

Correct AnswerAnswered by ExamLex AINo, these experiments are not contradict...View AnswerShow Answer

Biological evolution differs from chemical evolution in that biological evolution would have been possible only after the development of

Correct AnswerverifiedShow Answer

A dehydration synthesis reaction is also

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Describe the chicken-or-the-egg dilemma with enzymes and hereditary molecules,and detail how the "RNA world" proposal offers a solution.

Correct AnswerAnswered by ExamLex AIThe chicken-or-the-egg dilemma in the co...View AnswerShow 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

A solution that has a pH of 5 has

Correct AnswerverifiedShow Answer

Which of the following kinds of molecules is thought to have been absent from the primitive reducing 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?

Correct AnswerverifiedShow Answer

Describe the first evidence for chemical evolution that came from Stanley Miller's experiment.

Correct AnswerAnswered by ExamLex AIThe first evidence for chemical evolutio...View AnswerShow Answer

A peptide bond is found in which type of biological molecule?

Correct AnswerverifiedShow Answer

The ______________ theory proposes that pre-eukaryotes are the result of anaerobic bacteria ingesting aerobic bacteria and subsequently a symbiotic relationship was formed.

Correct AnswerverifiedShow Answer

Cholesterol belongs to which of the following groups?

Correct AnswerverifiedShow Answer

Which of the following carbohydrates is used in animal muscle and liver cells for energy storage?

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 critical answer to the chicken-or-the-egg problem formed by the nucleic-acid-or-enzyme-first dilemma is potentially solved by the discovery of catalytic RNAs called _______________.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
No, these experiments are not contradict...
View Answer

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The chicken-or-the-egg dilemma in the co...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The first evidence for chemical evolutio...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified