Question 1

The ancestral protocells

Accepted Answer

A)  may have contained RNA or DNA as their genetic material.
B)  may have evolved before the development of a true cell.
C)  may have had a lipid and protein membrane surrounding them,forming a proteinoid microsphere.
D)  may have contained a biochemical pathway for energy metabolism.
E)  All of the choices are correct.F) A) and D)
G) C) and E)

Question 2

Which of these statements is true about DNA?

Accepted Answer

A)  It is the genetic material of the cell
B)  It forms a protein
C)  It is pure amino acid
D)  It contains no sugarE) A) and D)
F) A) and B)

Question 3

The term ____________ refers broadly to compounds that contain carbon.

Accepted Answer

The answer of The term ____________ refers broadly to compounds...

Question 4

Scientists once assumed that the earliest protocells would have been autotrophs.This concept appears to be

Accepted Answer

A)  correct,since heterotrophs would depend upon eating autotrophs.
B)  correct,since glycolysis and fermentation only occur after oxygen is present from photosynthesis.
C)  incorrect,since the primordial soup likely contained many preformed food molecules suitable for heterotrophic metabolism.
D)  incorrect,since glycolysis and fermentation require complex enzymes for catalytic reactions.E) A) and C)
F) B) and C)

Question 5

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 D)
F) All of the above

Question 6

Spontaneous generation was first proposed as

Accepted Answer

A)  a concept to explain the formation of the first living cells on earth.
B)  a concept to explain the evolution of simple chemicals into complex macromolecules.
C)  an explanation for the appearance of maggots and mice from rotting material,fish from leaves that fall into water,etc.
D)  an explanation by Pasteur accounting for the germination of spores in broth.E) All of the above
F) None of the above

Question 7

Prions are infectious

Accepted Answer

A)  carbohydrates.
B)  proteins.
C)  lipids.
D)  Prions are not actually infectious.E) All of the above
F) A) and B)

Question 8

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 9

The earliest source of reduced compounds for oxidative metabolism was probably ____________ _____________.

Accepted Answer

The answer of The earliest source of reduced compounds for...

Question 10

Pasteur's work with spontaneous generation showed that

Accepted Answer

A)  life could not have evolved from non-living chemistry on the early earth.
B)  mice came from mother mice and maggots from mother flies.
C)  simple chemicals could become complex organic macromolecules without any living cell involved.
D)  broth did not ferment spontaneously but required contamination with organisms.E) A) and B)
F) B) and C)

Question 11

The alpha helix is found at which level of protein organization?

Accepted Answer

A)  Primary structure
B)  Secondary structure
C)  Tertiary structure
D)  Quaternary structureE) A) and D)
F) A) and C)

Question 12

Which of the following is NOT a steroid?

Accepted Answer

A)  Vitamin D
B)  Adrenocortical hormones
C)  Sex hormones
D)  Cholesterol
E)  All of the choices are steroidsF) C) and D)
G) C) and E)

Question 13

If the hypothesis that protocells were based on an "RNA world" is correct,what would be necessary to shift to a "DNA world"?

Accepted Answer

A)  An enzyme or reaction capable of removing one oxygen from ribose in nucleotides
B)  Enzymes for reverse transcription of RNA into DNA
C)  New enzymes to replicate the DNA
D)  New enzymes for transcribing DNA back to RNA
E)  All are necessary to switch to a "DNA world."F) C) and E)
G) A) and B)

Question 14

The molecule ___________ is an important form for storing sugar in animals and is found mainly in the liver and muscle cells of animals.

Accepted Answer

The answer of The molecule ___________ is an important form...

Question 15

Why can't we set up an experiment that would again duplicate the conditions that were present at the early origin of protocells?

Accepted Answer

Setting up an experiment to duplicate th...

Question 16

Does the recognition of prokaryotes as two major lineages,Archaebacteria and Eubacteria,result in any major changes to the internal taxonomic arrangement of the fungi,protozoan,plant,or animal groups?

Accepted Answer

The recognition of prokaryotes as two ma...

Question 17

Compare and contrast the prokaryotic and eukaryotic cellular structures.

Accepted Answer

Prokaryotic and eukaryotic cells are the...

Question 18

What may have been the "reason" for the "Cambrian explosion"?

Accepted Answer

The "Cambrian explosion" refers to a rel...

Question 19

The fact that nucleic acids are very complicated molecules suggests that

Accepted Answer

A)  the RNA-first hypothesis is impossible.
B)  the protein-first hypothesis is therefore the only plausible hypothesis.
C)  no natural system could ever generate them.
D)  None of the choices is correct.E) C) and D)
F) A) and D)

Exam 2: The Origin and Chemistry of Life

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

Correct Answer
verified

Does the recognition of prokaryotes as two major lineages,Archaebacteria and Eubacteria,result in any major changes to the internal taxonomic arrangement of the fungi,protozoan,plant,or animal groups?

Correct Answer
Answered by ExamLex AI
The recognition of prokaryotes as two ma...
View Answer

Why can't we set up an experiment that would again duplicate the conditions that were present at the early origin of protocells?

Correct Answer
Answered by ExamLex AI
Setting up an experiment to duplicate th...
View Answer

The molecule ___________ is an important form for storing sugar in animals and is found mainly in the liver and muscle cells of animals.

Correct Answer
verified

The ancestral protocells

Correct Answer
verified

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

Correct Answer
verified

Spontaneous generation was first proposed as

Correct Answer
verified

What may have been the "reason" for the "Cambrian explosion"?

Correct Answer
Answered by ExamLex AI
The "Cambrian explosion" refers to a rel...
View Answer

The term ____________ refers broadly to compounds that contain carbon.

Correct Answer
verified

The fact that nucleic acids are very complicated molecules suggests that

Correct Answer
verified

Which of the following is NOT a steroid?

Correct Answer
verified

The earliest source of reduced compounds for oxidative metabolism was probably _.

Correct Answer
verified

Compare and contrast the prokaryotic and eukaryotic cellular structures.

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

The alpha helix is found at which level of protein organization?

Correct Answer
verified

If the hypothesis that protocells were based on an "RNA world" is correct,what would be necessary to shift to a "DNA world"?

Correct Answer
verified

Scientists once assumed that the earliest protocells would have been autotrophs.This concept appears to be

Correct Answer
verified

Pasteur's work with spontaneous generation showed that

Correct Answer
verified

Prions are infectious

Correct Answer
verified

Which of these statements is true about DNA?

Correct Answer
verified

Exam 2: The Origin and Chemistry of Life

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

Correct AnswerverifiedShow Answer

Does the recognition of prokaryotes as two major lineages,Archaebacteria and Eubacteria,result in any major changes to the internal taxonomic arrangement of the fungi,protozoan,plant,or animal groups?

Correct AnswerAnswered by ExamLex AIThe recognition of prokaryotes as two ma...View AnswerShow Answer

Why can't we set up an experiment that would again duplicate the conditions that were present at the early origin of protocells?

Correct AnswerAnswered by ExamLex AISetting up an experiment to duplicate th...View AnswerShow Answer

The molecule ___________ is an important form for storing sugar in animals and is found mainly in the liver and muscle cells of animals.

Correct AnswerverifiedShow Answer

The ancestral protocells

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Spontaneous generation was first proposed as

Correct AnswerverifiedShow Answer

What may have been the "reason" for the "Cambrian explosion"?

Correct AnswerAnswered by ExamLex AIThe "Cambrian explosion" refers to a rel...View AnswerShow Answer

The term ____________ refers broadly to compounds that contain carbon.

Correct AnswerverifiedShow Answer

The fact that nucleic acids are very complicated molecules suggests that

Correct AnswerverifiedShow Answer

Which of the following is NOT a steroid?

Correct AnswerverifiedShow Answer

The earliest source of reduced compounds for oxidative metabolism was probably ____________ _____________.

Correct AnswerverifiedShow Answer

Compare and contrast the prokaryotic and eukaryotic cellular structures.

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

The alpha helix is found at which level of protein organization?

Correct AnswerverifiedShow Answer

If the hypothesis that protocells were based on an "RNA world" is correct,what would be necessary to shift to a "DNA world"?

Correct AnswerverifiedShow Answer

Scientists once assumed that the earliest protocells would have been autotrophs.This concept appears to be

Correct AnswerverifiedShow Answer

Pasteur's work with spontaneous generation showed that

Correct AnswerverifiedShow Answer

Prions are infectious

Correct AnswerverifiedShow Answer

Which of these statements is true about DNA?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The recognition of prokaryotes as two ma...
View Answer

Correct Answer
Answered by ExamLex AI
Setting up an experiment to duplicate th...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The "Cambrian explosion" refers to a rel...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The earliest source of reduced compounds for oxidative metabolism was probably _.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified