Question 1

The oldest fossils of eukaryotes have been estimated to be

Accepted Answer

A)  6000 years old.
B)  8 billion years old.
C)  4.5 billion years old.
D)  1.5 billion years old.
E)  1995 years old.

Question 2

Which of the following was produced in experiments on primitive Earth conditions conducted by Miller-Urey and others?

Accepted Answer

A)  ammonia and water
B)  amino acids
C)  CO2 and H2O
D)  ammonia and hydrogen sulfide
E)  methane and oxygen

Question 3

The age of the Earth according to modern estimations is about

Accepted Answer

A)  8 billion years.
B)  4.6 billion years.
C)  3.5 billion years.
D)  1.5 billion years.
E)  a few thousand years.

Question 4

Eukaryotic cells acquired mitochondria and chloroplasts by

Accepted Answer

A)  endosymbiosis.
B)  exocytosis.
C)  pinocytosis.
D)  mutation.
E)  natural selection.

Question 5

How would the hydrolysis of phosphodiester bonds impede the origin of life?

Accepted Answer

A)  It would slow the rate of protein synthesis.
B)  It would prevent the assembly of nucleic acids.
C)  It would stop the formation of cell membranes.
D)  It would digest amino acids.

Question 6

Why is there free oxygen in the air?

Accepted Answer

A)  Organisms need oxygen to manufacture ATP.
B)  Free oxygen has been present since the formation of the earth's atmosphere.
C)  Evaporation of the oceans liberated oxygen.
D)  It is a by-product of photosynthesis.
E)  Free oxygen has seeped from cracks in the earth's crust.

Question 7

Two principal organelles in eukaryotes that were apparently derived from different types of bacteria are the

Accepted Answer

A)  microfilaments and microtubules.
B)  mitochondria and chloroplasts.
C)  rough ER and smooth ER.
D)  plasma membrane and nuclear membrane.

Question 8

True multicellularity is a major characteristic of

Accepted Answer

A)  all eukaryotes and a few prokaryotes.
B)  animals and plants only.
C)  eukaryotes only.
D)  protists,plants,and animals.
E)  prokaryotes and protists.

Question 9

A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere.What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?

Accepted Answer

A)  The ratio of the carbon-12 isotope will be lower in the younger rocks,because living organisms preferentially use carbon-12 over other isotopes.
B)  The younger rocks will have higher levels of carbon dioxide,because there was no carbon dioxide in the atmosphere before animals evolved and expelled it as waste.
C)  The ratio of carbon-12 will be lower in the older rocks,because carbon-12 had to build up on earth before life could evolve.
D)  The amount of carbon will vary unpredictably in the younger rocks,because rock weathering added carbon dioxide to the atmosphere,and volcanic activity sequestered it.

Question 10

Why is a reducing atmosphere conducive to the origin of life?

Accepted Answer

A)  It is more favorable for the development of organic molecules.
B)  It is rich in free oxygen.
C)  It is devoid of organic molecules.
D)  It is very similar to today's atmosphere.

Question 11

RNA was probably the first molecule used to encode genetic information; the use of DNA came later.This is due to RNA's inherent stability and its ability to store information more accurately than DNA.

Accepted Answer

A) True 
 B)False

Question 12

What would result for global climate from a massive drop in atmospheric carbon dioxide?

Accepted Answer

A)  An increase in ocean temperature
B)  Increased rock weathering
C)  A decrease in surface temperature
D)  Increased nitrogen availability
E)  A decrease in free oxygen content

Question 13

In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment,which one of the following would you NOT expect to find in the collection flask?

Accepted Answer

A)  urea
B)  amino acids
C)  ATP
D)  adenine
E)  formaldehyde

Question 14

Infolding of the cellular membrane has led to the development of the

Accepted Answer

A)  chloroplast
B)  mitochondria
C)  nuclear envelope
D)  nucleolus
E)  ribosome

Question 15

Homo sapiens have existed on earth for 2% of the earth's history.

Accepted Answer

A) True 
 B)False

Exam 25: The Origin and Diversity of Life

Two principal organelles in eukaryotes that were apparently derived from different types of bacteria are the

Correct Answer
verified

Homo sapiens have existed on earth for 2% of the earth's history.

Correct Answer
verified

In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment,which one of the following would you NOT expect to find in the collection flask?

Correct Answer
verified

RNA was probably the first molecule used to encode genetic information; the use of DNA came later.This is due to RNA's inherent stability and its ability to store information more accurately than DNA.

Correct Answer
verified

How would the hydrolysis of phosphodiester bonds impede the origin of life?

Correct Answer
verified

True multicellularity is a major characteristic of

Correct Answer
verified

The oldest fossils of eukaryotes have been estimated to be

Correct Answer
verified

A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere.What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?

Correct Answer
verified

Which of the following was produced in experiments on primitive Earth conditions conducted by Miller-Urey and others?

Correct Answer
verified

Infolding of the cellular membrane has led to the development of the

Correct Answer
verified

Why is a reducing atmosphere conducive to the origin of life?

Correct Answer
verified

The age of the Earth according to modern estimations is about

Correct Answer
verified

What would result for global climate from a massive drop in atmospheric carbon dioxide?

Correct Answer
verified

Eukaryotic cells acquired mitochondria and chloroplasts by

Correct Answer
verified

Why is there free oxygen in the air?

Correct Answer
verified

Exam 25: The Origin and Diversity of Life

Two principal organelles in eukaryotes that were apparently derived from different types of bacteria are the

Correct AnswerverifiedShow Answer

Homo sapiens have existed on earth for 2% of the earth's history.

Correct AnswerverifiedShow Answer

In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment,which one of the following would you NOT expect to find in the collection flask?

Correct AnswerverifiedShow Answer

RNA was probably the first molecule used to encode genetic information; the use of DNA came later.This is due to RNA's inherent stability and its ability to store information more accurately than DNA.

Correct AnswerverifiedShow Answer

How would the hydrolysis of phosphodiester bonds impede the origin of life?

Correct AnswerverifiedShow Answer

True multicellularity is a major characteristic of

Correct AnswerverifiedShow Answer

The oldest fossils of eukaryotes have been estimated to be

Correct AnswerverifiedShow Answer

A scientist is analyzing air bubbles trapped in ancient rocks that can be used to understand the ancient atmosphere.What do you expect the scientist will observe when comparing rocks younger than 3.8 billion years old to rocks older than 3.8 billion years?

Correct AnswerverifiedShow Answer

Which of the following was produced in experiments on primitive Earth conditions conducted by Miller-Urey and others?

Correct AnswerverifiedShow Answer

Infolding of the cellular membrane has led to the development of the

Correct AnswerverifiedShow Answer

Why is a reducing atmosphere conducive to the origin of life?

Correct AnswerverifiedShow Answer

The age of the Earth according to modern estimations is about

Correct AnswerverifiedShow Answer

What would result for global climate from a massive drop in atmospheric carbon dioxide?

Correct AnswerverifiedShow Answer

Eukaryotic cells acquired mitochondria and chloroplasts by

Correct AnswerverifiedShow Answer

Why is there free oxygen in the air?

Correct AnswerverifiedShow Answer

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