Question 1

Organisms that gain energy from feeding directly or indirectly on producers are referred to as

Accepted Answer

A)  autotrophs.
B)  chemotrophs.
C)  phototrophs.
D)  heterotrophs.

Question 2

Microbial pyrite precipitation plays a key role in which cycle?

Accepted Answer

A)  the iron cycle
B)  the hydrogen cycle
C)  the sulfur cycle
D)  the carbon cycle

Question 3

The three domains of life are

Accepted Answer

A)  bacteria,eukarya,thermotoga.
B)  archaea,eukarya,extremophiles.
C)  eukarya,bacteria,archaea.
D)  eukarya,microbes,archaea.

Question 4

The impact site for the giant Cretaceous-Tertiary asteroid is known as the ______ crater.

Accepted Answer

A)  K-T
B)  Chicxulub
C)  Mayan
D)  Iridium

Question 5

In which geologic environment would you expect to find halophiles?

Accepted Answer

A)  a mid-ocean ridge
B)  an alluvial fan
C)  an abyssal plain
D)  a playa lake

Question 6

Microbes can facilitate mineral growth indirectly by

Accepted Answer

A)  providing a site for minerals to nucleate.
B)  increasing the rate of chemical weathering.
C)  producing enzymes that cause minerals to grow.
D)  decreasing the rate of chemical weathering.

Question 7

Cyanobacteria are _____ who get their energy from the ______ and carbon from ______.

Accepted Answer

A)  chemoautotroph; chemicals; organic compounds
B)  photoheterotroph; Sun; carbon dioxide
C)  photoautotroph; chemicals; organic compounds
D)  photoautotroph; Sun; carbon dioxide

Question 8

Modern stromatolites are typically found in what sedimentary environment?

Accepted Answer

A)  deep-marine
B)  highly saline lagoons
C)  alluvial
D)  intertidal zone

Question 9

A mineral commonly found in black shales because of microbial precipitation is

Accepted Answer

A)  quartz.
B)  pyrite.
C)  calcite.
D)  halite.

Question 10

The boundaries of the Phanerozoic are marked by the __________ of particular groups of organisms followed by ________ of new groups of organisms.

Accepted Answer

A)  radiation; extinction
B)  fossilization; radiation
C)  extinction; fossilization
D)  extinction; radiation

Question 11

What is the one finding or assumption that could cast doubt on the role of stromatolites in the early evolution of life on Earth?

Accepted Answer

A)  They form in aquatic environments .
B)  They are one of the most commonly preserved sedimentary features in Precambrian time.
C)  They come in different shapes (sheets and domes) .
D)  The interaction between microorganism and minerals and sediments is poorly understood.

Question 12

In order for life to originate,plants need __________ for a long enough period.

Accepted Answer

A)  amino acids on the surface
B)  oxygen in the atmosphere
C)  carbon dioxide in the atmosphere
D)  liquid water on the surface

Question 13

Which chemical compound makes up 50 percent to 95 percent of most living organisms?

Accepted Answer

A)  carbon dioxide
B)  methane
C)  water
D)  oxygen

Question 14

The initial rise of oxygen in the Earth's atmosphere is linked to

Accepted Answer

A)  photosynthesis.
B)  outgassing of volcanoes.
C)  chemosynthesis.
D)  cyanobacteria.

Question 15

Halophiles differ from thermophiles in that

Accepted Answer

A)  halophiles thrive in high-salinity environments and thermophiles thrive in anoxic environments.
B)  halophiles thrive in acidic environments and thermophiles thrive in high-temperature environments.
C)  halophiles thrive in high-temperature environments and thermophiles thrive in highly acidic environments.
D)  halophiles thrive in high-salinity environments and thermophiles thrive in high-temperature environments.

Question 16

What significant geobiological event took place 542 Ma ago?

Accepted Answer

A)  largest mass extinction in Earth's history
B)  the first appearance of Homo sapiens
C)  the mass extinction of the dinosaurs
D)  the Cambrian explosion

Question 17

Sedimentary rocks composed of alternating layers of magnetite,hematite,and chert are called

Accepted Answer

A)  layered iron formations.
B)  magnetic-silica formations.
C)  silica-iron formations.
D)  banded iron formations.

Question 18

The part of the Earth that contains living organisms is called the

Accepted Answer

A)  geosphere.
B)  lithosphere.
C)  biosphere.
D)  stratosphere.

Question 19

What type of extremophiles are likely to thrive in oxygen deprived environments?

Accepted Answer

A)  acidophiles
B)  thermophiles
C)  halophiles
D)  anerobes

Question 20

Cynaobacteria are an example of

Accepted Answer

A)  photoautotrophs.
B)  photoheterotrophs.
C)  chemoauthotrophs.
D)  chemoheterotrophs.

Exam 11: Geobiology: Life Interacts With Earth

Modern stromatolites are typically found in what sedimentary environment?

Correct AnswerverifiedShow Answer

The three domains of life are

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A mineral commonly found in black shales because of microbial precipitation is

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Microbes can facilitate mineral growth indirectly by

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The impact site for the giant Cretaceous-Tertiary asteroid is known as the ______ crater.

Correct AnswerverifiedShow Answer

Cynaobacteria are an example of

Correct AnswerverifiedShow Answer

Microbial pyrite precipitation plays a key role in which cycle?

Correct AnswerverifiedShow Answer

The boundaries of the Phanerozoic are marked by the __________ of particular groups of organisms followed by ________ of new groups of organisms.

Correct AnswerverifiedShow Answer

What is the one finding or assumption that could cast doubt on the role of stromatolites in the early evolution of life on Earth?

Correct AnswerverifiedShow Answer

What type of extremophiles are likely to thrive in oxygen deprived environments?

Correct AnswerverifiedShow Answer

Cyanobacteria are _____ who get their energy from the ______ and carbon from ______.

Correct AnswerverifiedShow Answer

The initial rise of oxygen in the Earth's atmosphere is linked to

Correct AnswerverifiedShow Answer

Which chemical compound makes up 50 percent to 95 percent of most living organisms?

Correct AnswerverifiedShow Answer

Halophiles differ from thermophiles in that

Correct AnswerverifiedShow Answer

The part of the Earth that contains living organisms is called the

Correct AnswerverifiedShow Answer

Sedimentary rocks composed of alternating layers of magnetite,hematite,and chert are called

Correct AnswerverifiedShow Answer

What significant geobiological event took place 542 Ma ago?

Correct AnswerverifiedShow Answer

Organisms that gain energy from feeding directly or indirectly on producers are referred to as

Correct AnswerverifiedShow Answer

In order for life to originate,plants need __________ for a long enough period.

Correct AnswerverifiedShow Answer

In which geologic environment would you expect to find halophiles?

Correct AnswerverifiedShow Answer

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The boundaries of the Phanerozoic are marked by the __ of particular groups of organisms followed by of new groups of organisms.

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Cyanobacteria are _ who get their energy from the and carbon from ____.

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