Question 1

How did the first life on Earth obtain energy?

Accepted Answer

A)   photosynthesis in the presence of oxygen
B)   photosynthesis in the absence of oxygen
C)   heterotrophic consumption of organic molecules
D)   autotrophic consumption of organic molecules
E)   phototrophic consumption of inorganic moleculesF) B) and D)
G) A) and B)

Question 2

In fungi,a mass of aggregated hyphae is called a(n)

Accepted Answer

A)   mycelium.
B)   pilus.
C)   gill.
D)   spore.
E)   ascus.F) None of the above
G) C) and D)

Question 3

The region of a prokaryotic cell where the bacterial chromosome (DNA) is located is the

Accepted Answer

A)   cell membrane.
B)   nucleus.
C)   cell wall.
D)   nucleoid.
E)   ribosome.F) C) and D)
G) B) and C)

Question 4

Which protists produce much of the Earth's oxygen?

Accepted Answer

A)   amoeba
B)   slime molds
C)   algae
D)   protozoa
E)   radiolariansF) B) and E)
G) A) and D)

Question 5

Which theory explains the origin of chloroplasts and mitochondria?

Accepted Answer

A)   the theory of evolution
B)   the theory of natural selection
C)   the geologic time theory
D)   the cell theory
E)   the endosymbiont theoryF) D) and E)
G) B) and E)

Question 6

If a friend at the next lab bench was working on an unknown fungus and shouted "I've found zygospores," you would tell your friend that the fungus was probably a member of the

Accepted Answer

A)   Chytridiomycota.
B)   Ascomycota.
C)   Zygomycota.
D)   Basidiomycota.
E)   Glomeromycota.F) A) and B)
G) C) and D)

Question 7

Yeasts are

Accepted Answer

A)   multicelled autotrophs.
B)   single-celled heterotrophs.
C)   single-celled autotrophs.
D)   multicelled heterotrophs.
E)   All answers are correct.F) A) and B)
G) A) and C)

Question 8

Fungi are classified into phyla based on which characteristic?

Accepted Answer

A)   organelles
B)   composition of cell wall
C)   photosynthesis
D)   reproductive structures
E)   multicellular vs. unicellularF) B) and C)
G) B) and D)

Question 9

A jellylike substance produced by red algae and used as a culture medium for microorganisms is

Accepted Answer

A)   red ooze.
B)   All answers are correct.
C)   gelatin.
D)   agar.
E)   algin.F) A) and E)
G) A) and B)

Question 10

Silica walls are a characteristic of

Accepted Answer

A)   diatoms.
B)   euglenoids.
C)   red algae.
D)   brown algae.
E)   slime molds.F) B) and C)
G) A) and E)

Question 11

How did multicellular organisms evolve from unicellular organisms?

Accepted Answer

A)   Single-celled organisms joined together, or failed to separate after cell division.
B)   Single-celled organisms joined together only.
C)   Single-celled organisms failed to separate after cell division only.
D)   Single-celled organisms joined together, or absorbed other species by endosymbiosis.
E)   One species absorbed another species by endosymbiosis only.F) A) and E)
G) A) and D)

Question 12

Which of the following was not a characteristic of the Hadean eon?

Accepted Answer

A)   volcanic eruptions and earthquakes
B)   prokaryotic life appeared at the end of this eon
C)   ultraviolet radiation
D)   large amounts of comets and meteorites
E)   photosynthetic organisms were abundantF) B) and D)
G) A) and B)

Question 13

Autotrophs must acquire carbon from organic molecules produced from other organisms.

Accepted Answer

A) True 
 B)False

Question 14

A prokaryote that occupies a habitat that is characterized by extreme heat (above 50°C) is a(n)

Accepted Answer

A)   thermophile.
B)   acidophile.
C)   halophile.
D)   basophile.
E)   hydrophile.F) C) and D)
G) A) and E)

Question 15

Sexual spores are formed by the fusion of two haploid nuclei.They then go through meiosis to form spores.Spores are which of the following?

Accepted Answer

A)   haploid
B)   diploid
C)   dikaryotic
D)   tetraploid
E)   uniploidF) A) and C)
G) All of the above

Question 16

In setting up a lab for a general biology course,you are asked to match labels with a timeline on the wall.For "First Cells," you need to find a point on the timeline

Accepted Answer

A)   500 million years ago.
B)   1.2 billion years ago.
C)   two billion years ago.
D)   six billion years ago.
E)   four billion years ago.F) C) and E)
G) None of the above

Question 17

Protists can be autotrophs.

Accepted Answer

A) True 
 B)False

Question 18

The first life on Earth was probably most similar to modern-day

Accepted Answer

A)   bacteria.
B)   protists.
C)   Archaeans.
D)   plants.
E)   fungi.F) A) and E)
G) A) and D)

Question 19

All protists

Accepted Answer

A)   are prokaryotes.
B)   lack a nucleus.
C)   lack membrane-bounded organelles.
D)   are eukaryotes.
E)   are multicellular.F) A) and B)
G) B) and D)

Question 20

Dictyostelium discoideum consists of amoeba-like cells that move independently,feeding on bacteria.When the food runs out,cells begin to aggregate to produce spores.Dictyostelium discoideum is which kind of organism?

Accepted Answer

A)   an autotroph
B)   a heterotroph and autotroph
C)   a heterotroph
D)   a detritovore
E)   a heterotroph and detritovoreF) B) and C)
G) A) and D)

Exam 15: Evolution and Diversity of Microbial Life

How did multicellular organisms evolve from unicellular organisms?

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If a friend at the next lab bench was working on an unknown fungus and shouted "I've found zygospores," you would tell your friend that the fungus was probably a member of the

Correct AnswerverifiedShow Answer

In fungi,a mass of aggregated hyphae is called a(n)

Correct AnswerverifiedShow Answer

Which theory explains the origin of chloroplasts and mitochondria?

Correct AnswerverifiedShow Answer

Which of the following was not a characteristic of the Hadean eon?

Correct AnswerverifiedShow Answer

Fungi are classified into phyla based on which characteristic?

Correct AnswerverifiedShow Answer

Silica walls are a characteristic of

Correct AnswerverifiedShow Answer

Yeasts are

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A jellylike substance produced by red algae and used as a culture medium for microorganisms is

Correct AnswerverifiedShow Answer

How did the first life on Earth obtain energy?

Correct AnswerverifiedShow Answer

The region of a prokaryotic cell where the bacterial chromosome (DNA) is located is the

Correct AnswerverifiedShow Answer

A prokaryote that occupies a habitat that is characterized by extreme heat (above 50°C) is a(n)

Correct AnswerverifiedShow Answer

Autotrophs must acquire carbon from organic molecules produced from other organisms.

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Protists can be autotrophs.

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Dictyostelium discoideum consists of amoeba-like cells that move independently,feeding on bacteria.When the food runs out,cells begin to aggregate to produce spores.Dictyostelium discoideum is which kind of organism?

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All protists

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Sexual spores are formed by the fusion of two haploid nuclei.They then go through meiosis to form spores.Spores are which of the following?

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In setting up a lab for a general biology course,you are asked to match labels with a timeline on the wall.For "First Cells," you need to find a point on the timeline

Correct AnswerverifiedShow Answer

The first life on Earth was probably most similar to modern-day

Correct AnswerverifiedShow Answer

Which protists produce much of the Earth's oxygen?

Correct AnswerverifiedShow Answer

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