Question 1

Consider the 4.6-billion-year history of the Earth. Geological and fossil evidence indicates that during the greatest fraction of its history, the Earth

Accepted Answer

A)  was too hot to have either a solid surface or any form of life.
B)  had organic molecules in liquid water, but no living forms.
C)  had unicellular organisms, but not multicellular.
D)  had both multicellular and unicellular organisms, but no terrestrial (land)  forms.
E)  had both terrestrial, freshwater, and marine organisms, both unicellular and multicellular.

Question 2

The endosymbiont hypothesis suggests that the mitochondria of eukaryotic cells are descended from captured

Accepted Answer

A)  cyanobacteria.
B)  archaebacteria.
C)  aerobic bacteria.
D)  chemoautotrophic bacteria.
E)  eukaryotic algae.

Question 3

Which of the following provided the selective pressures that most directly promoted the evolution of photosynthesis?

Accepted Answer

A)  the drop in surface UV radiation caused by the formation of the ozone layer
B)  the depletion of dissolved organic material from the oceans
C)  the ability of some organisms to use oxygen to generate ATP during respiration
D)  an increase in visible light intensity at the surface of the Earth, caused by solar flares
E)  an increase in volcanic activity and release of CO2 into the atmosphere

Question 4

Since all organisms contain DNA (or RNA), how can DNA be used as a trait in studying phylogeny?

Accepted Answer

Responses should explain that the presen...

Question 5

Match between columns
                        Premises: The dinosaurs became extinct.
The Cambrian Explosion has left fossils of many soft-bodied animals.
First cells to contain chloroplasts and mitochondria appeared.
Atmosphere is believed to be like ours today.
The single supercontinent Pangea is present.

Accepted Answer

The Answer of 580 million years ago and 245 million is...

Question 6

Discuss the rationale behind taxonomists placing sharks and dolphins in different taxonomic groups, even though they are both aquatic, have very similar body forms, and share other traits as well.

Accepted Answer

Responses should point out tha...

Question 7

Many scientists feel that we are headed toward another mass extinction because of man's actions and our effect on the ecosystem Earth. What have we learned from previous mass extinctions that may provide an idea of the consequences of such a mass extinction? What should man do to try to prevent such an occurrence?

Accepted Answer

The following ideas should be discussed:...

Question 8

Consider the evolution of metabolic pathways. We believe that these pathways evolved from the

Accepted Answer

A)  precursor to the end product, as enzymes became more efficient over time.
B)  precursor to the end product, as cells simplified the biochemistry of the external environment.
C)  end product to the precursor, as cells gradually evolved according to a predetermined plan.
D)  end product to the precursor, as intermediates in the pathway were depleted in the environment.
E)  end product to the precursor, as photosynthesis began to supply the energy to power the changes at each stage.

Question 9

Match between columns
                        Premises: Possible origin of chloroplasts and mitochondria
Can obtain nourishment from external sources
Can use carbon dioxide to produce organic molecules
Can generate organic molecules using inorganic molecules like hydrogen sulfide and iron
Able to use oxygen as a final electron acceptor

Accepted Answer

The Answer of endosymbiont and heterotrophs and chemoautotrophs and autotrophs is...

Question 10

Match between columns
                        Premises: First anaerobic heterotrophs
First animals with calcium skeletons and shells
Oxygen-producing photosynthesizers
First multicellular organisms
First land forms
Eukaryotes

Accepted Answer

The Answer of 540 million years ago and 2.6 billion is...

Question 11

Scientists believe that macromolecules could have been formed before there were living cells by

Accepted Answer

A)  chemical processes removing water from components.
B)  oxidation of compounds containing phosphate.
C)  lightning discharge catalyzing addition of water to molecules.
D)  enzyme-mediated condensation reactions.
E)  acidic hydrolysis of compounds in the Earth's oceans.

Question 12

Match between columns
                        Premises: E. coli
mosses and ferns
molds and yeasts
sponges
Euglena and Paramecium

Accepted Answer

The Answer of Archaea and Bacteria and Protista and Plantae is...

Question 13

Oxygen built up in the atmosphere approximately 2 billion years ago and

Accepted Answer

A)  occurred due to carbon dioxide being split by lightning strikes.
B)  could not have occurred without the oxygen coming from outer space.
C)  destroyed ozone forming more oxygen.
D)  helped to form the ozone layer that is so important to life today.
E)  occurred because aerobic organisms required the oxygen.

Exam 10: Lifes Origins and Biodiversity

Consider the 4.6-billion-year history of the Earth. Geological and fossil evidence indicates that during the greatest fraction of its history, the Earth

Correct Answer
verified

Oxygen built up in the atmosphere approximately 2 billion years ago and

Correct Answer
verified

Match the following examples with the correct descriptive term.

Correct Answer
verified
The following ideas should be discussed:...
View Answer

Since all organisms contain DNA (or RNA), how can DNA be used as a trait in studying phylogeny?

Correct Answer
verified
Responses should explain that the presen...
View Answer

Scientists believe that macromolecules could have been formed before there were living cells by

Correct Answer
verified

Match the organism to the time frame that indicates when we first see fossil evidence this form existed.

Match the following events with the best estimated time.

Which of the following provided the selective pressures that most directly promoted the evolution of photosynthesis?

Correct Answer
verified

The endosymbiont hypothesis suggests that the mitochondria of eukaryotic cells are descended from captured

Correct Answer
verified

Discuss the rationale behind taxonomists placing sharks and dolphins in different taxonomic groups, even though they are both aquatic, have very similar body forms, and share other traits as well.

Correct Answer
verified
Responses should point out tha...
View Answer

Consider the evolution of metabolic pathways. We believe that these pathways evolved from the

Correct Answer
verified

Match living form to its kingdom or domain.

Exam 10: Lifes Origins and Biodiversity

Consider the 4.6-billion-year history of the Earth. Geological and fossil evidence indicates that during the greatest fraction of its history, the Earth

Correct AnswerverifiedShow Answer

Oxygen built up in the atmosphere approximately 2 billion years ago and

Correct AnswerverifiedShow Answer

Match the following examples with the correct descriptive term.

Correct AnswerverifiedThe following ideas should be discussed:...View AnswerShow Answer

Since all organisms contain DNA (or RNA), how can DNA be used as a trait in studying phylogeny?

Correct AnswerverifiedResponses should explain that the presen...View AnswerShow Answer

Scientists believe that macromolecules could have been formed before there were living cells by

Correct AnswerverifiedShow Answer

Match the organism to the time frame that indicates when we first see fossil evidence this form existed.

Match the following events with the best estimated time.

Which of the following provided the selective pressures that most directly promoted the evolution of photosynthesis?

Correct AnswerverifiedShow Answer

The endosymbiont hypothesis suggests that the mitochondria of eukaryotic cells are descended from captured

Correct AnswerverifiedShow Answer

Discuss the rationale behind taxonomists placing sharks and dolphins in different taxonomic groups, even though they are both aquatic, have very similar body forms, and share other traits as well.

Correct AnswerverifiedResponses should point out tha...View AnswerShow Answer

Consider the evolution of metabolic pathways. We believe that these pathways evolved from the

Correct AnswerverifiedShow Answer

Match living form to its kingdom or domain.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The following ideas should be discussed:...
View Answer

Correct Answer
verified
Responses should explain that the presen...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Responses should point out tha...
View Answer

Correct Answer
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