Question 1

Which of the following options lists the events of protist evolution in the correct order,according to current science?

Accepted Answer

A)  Mitochondria and then chloroplasts evolved through primary endosymbiosis; later,protozoans were incorporated into several other groups of protists through secondary endosymbiosis.
B)  Mitochondria and then chloroplasts evolved through primary endosymbiosis; later,algae were incorporated into several other groups of protists through secondary endosymbiosis.
C)  Chloroplasts and then mitochondria evolved through primary endosymbiosis; later,algae were incorporated into several other groups of protists through secondary endosymbiosis.
D)  Mitochondria evolved through primary endosymbiosis; chloroplasts then evolved through secondary endosymbiosis.E) C) and D)
F) B) and D)

Question 2

Which of the following causes food poisoning and typhoid fever?

Accepted Answer

A)  Bacillus anthracis
B)  Salmonella
C)  Clostridium botulinum
D)  E.coliE) A) and B)
F) C) and D)

Question 3

Which of the following groups includes the protists that reside within the cells of corals?

Accepted Answer

A)  diatoms
B)  ciliates
C)  brown algae
D)  dinoflagellatesE) A) and C)
F) All of the above

Question 4

Which of the following is a member of the domain Archaea?

Accepted Answer

A)  spirochetes
B)  methanogens
C)  chlamydias
D)  gram- positive bacteriaE) None of the above
F) All of the above

Question 5

Which stage of the life cycle shown is the sporophyte?

Accepted Answer

A)  stage A
B)  stage B
C)  stage C
D)  stage DE) A) and B)
F) All of the above

Question 6

Evidence for the relatively close relationship of archaea to eukaryotes includes

Accepted Answer

A)  the presence of peptidoglycan in the cell walls of both groups.
B)  the absence of introns from genes in both groups.
C)  the fact that both have several kinds of relatively complex RNA polymerases
D)  the fact that both contain circular DNA without histones.E) All of the above
F) A) and C)

Question 7

Plasmodium,the organism that causes malaria,is a(n)

Accepted Answer

A)  amoeba.
B)  ciliate.
C)  stramenopile.
D)  chromalveolate.E) A) and B)
F) B) and D)

Question 8

The term for a close association between organisms of two or more species is

Accepted Answer

A)  interdependence.
B)  associative living.
C)  colonialism.
D)  symbiosis.E) B) and C)
F) A) and B)

Question 9

In secondary endosymbiosis,a(n) became endosymbiotic in a(n) _ .

Accepted Answer

A)  heterotrophic eukaryotic protist ...autotrophic heterotrophic protist
B)  autotrophic eukaryotic protist ...heterotrophic eukaryotic protist
C)  autotrophic prokaryote ...heterotrophic eukaryotic protist
D)  heterotrophic prokaryote ...autotrophic eukaryotic protistE) A) and B)
F) A) and C)

Question 10

are toxic proteins secreted by pathogenic bacteria,whereas are toxic components of the outer membrane of gram- negative pathogens.

Accepted Answer

A)  Endotoxins ...phosphotoxins
B)  Exotoxins ...enterotoxins
C)  Exotoxins ...endotoxins
D)  Endotoxins ...botulinum toxinsE) C) and D)
F) All of the above

Question 11

The trickling filter at a sewage treatment plant works by

Accepted Answer

A)  passing wastewater through a thick bed of rocks.Biofilms of bacteria and fungi on the rocks remove much of the organic material dissolved in the wastewater.
B)  adding fertilizer to wastewater and passing it through a culture medium rich in oil- eating prokaryotes.
C)  passing wastewater through fine sand,mechanically removing fine pollution particles.
D)  passing wastewater through a thick bed of rocks that contain chemicals that sterilize the water and neutralize chemical pollutants or bind with them to produce a harmless precipitate.E) A) and D)
F) All of the above

Question 12

Eukaryotes are prokaryotes.

Accepted Answer

A)  more ancient than
B)  dependent upon
C)  more numerous than
D)  more widespread thanE) B) and D)
F) None of the above

Question 13

An unknown bacterial species is recovered from a sick patient's digestive tract.It has a membrane outside the cell wall that contains toxic lipids.This observation indicates

Accepted Answer

A)  that the infection should be relatively easy to control with common antibiotics,because the pathogen is a gram- negative species.
B)  that the infection may be quite threatening and difficult to control,because the pathogen is a gram- negative species.
C)  that the infection may be quite threatening and difficult to control,because the pathogen is a gram- positive species.
D)  that the infection should be relatively easy to control with common antibiotics,because the pathogen is a gram- positive species.E) A) and B)
F) B) and C)

Question 14

Many species of which protist group have modified mitochondria that lack functional electron transport chains?

Accepted Answer

A)  excavates
B)  unikonts
C)  rhizarians
D)  ciliatesE) A) and B)
F) A) and C)

Question 15

You collect a protist from a rotting log and grow it in a petri dish containing E.coli,which it engulfs.For a while the protists multiply as single cells.Then the E.coli run short,and the protists aggregate to form a clump,which rises up to become a stalked structure with a globular head.What kind of protist have you got?

Accepted Answer

A)  a water mold
B)  a free- living amoeba
C)  a plasmodial slime mold
D)  a cellular slime moldE) A) and B)
F) C) and D)

Question 16

Cyanobacteria

Accepted Answer

A)  are chemoautotrophs.
B)  are eukaryotes and are the earliest type of algae.
C)  are photosynthetic archaea.
D)  are the only prokaryotes with plantlike oxygen- generating photosynthesis.E) B) and C)
F) None of the above

Question 17

The three diseases that represent high- priority threats as biological weapons today are

Accepted Answer

A)  smallpox,influenza,and typhus.
B)  syphilis,Chlamydia,and HIV.
C)  anthrax,smallpox,and Thiobacillus.
D)  anthrax,plague,and botulinum toxin.E) B) and D)
F) B) and C)

Question 18

One difference between gram- positive and gram- negative bacteria is

Accepted Answer

A)  gram- positive bacteria are spiral- shaped and gram- negative bacteria are either rod- shaped or spherical.
B)  only gram- negative bacteria can form endospores.
C)  gram- positive bacteria have more peptidoglycan in their cell walls.
D)  gram- positive bacteria have fimbriae but gram- negative bacteria do not.E) All of the above
F) A) and B)

Question 19

In what way does the green alga Ulva resemble land plants?

Accepted Answer

A)  It has a complex life cycle with diploid body cells and haploid gametes.
B)  It has a complex life cycle with alternation between multicellular diploid and haploid generations.
C)  It has a multicellular haploid stage that alternates with a unicellular diploid stage.
D)  It produces diploid gametes.E) None of the above
F) All of the above

Question 20

Unlike archaean and eukaryote cell walls,bacterial cell walls contain a unique substance called

Accepted Answer

A)  glycogen.
B)  cellulose.
C)  phospholipid.
D)  peptidoglycan.E) C) and D)
F) B) and C)

Exam 16: Microbial Life: Prokaryotes and Protists

Correct Answer
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Cyanobacteria

Correct Answer
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Which stage of the life cycle shown is the sporophyte?

Correct Answer
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The trickling filter at a sewage treatment plant works by

Correct Answer
verified

The three diseases that represent high- priority threats as biological weapons today are

Correct Answer
verified

Plasmodium,the organism that causes malaria,is a(n)

Correct Answer
verified

Which of the following causes food poisoning and typhoid fever?

Correct Answer
verified

In secondary endosymbiosis,a(n) became endosymbiotic in a(n) _ .

Correct Answer
verified

Which of the following is a member of the domain Archaea?

Correct Answer
verified

are toxic proteins secreted by pathogenic bacteria,whereas are toxic components of the outer membrane of gram- negative pathogens.

Correct Answer
verified

The term for a close association between organisms of two or more species is

Correct Answer
verified

Eukaryotes are prokaryotes.

Correct Answer
verified

Evidence for the relatively close relationship of archaea to eukaryotes includes

Correct Answer
verified

In what way does the green alga Ulva resemble land plants?

Correct Answer
verified

Unlike archaean and eukaryote cell walls,bacterial cell walls contain a unique substance called

Correct Answer
verified

An unknown bacterial species is recovered from a sick patient's digestive tract.It has a membrane outside the cell wall that contains toxic lipids.This observation indicates

Correct Answer
verified

Which of the following groups includes the protists that reside within the cells of corals?

Correct Answer
verified

Many species of which protist group have modified mitochondria that lack functional electron transport chains?

Correct Answer
verified

One difference between gram- positive and gram- negative bacteria is

Correct Answer
verified

Which of the following options lists the events of protist evolution in the correct order,according to current science?

Correct Answer
verified

Exam 16: Microbial Life: Prokaryotes and Protists

Correct AnswerverifiedShow Answer

Cyanobacteria

Correct AnswerverifiedShow Answer

Which stage of the life cycle shown is the sporophyte?

Correct AnswerverifiedShow Answer

The trickling filter at a sewage treatment plant works by

Correct AnswerverifiedShow Answer

The three diseases that represent high- priority threats as biological weapons today are

Correct AnswerverifiedShow Answer

Plasmodium,the organism that causes malaria,is a(n)

Correct AnswerverifiedShow Answer

Which of the following causes food poisoning and typhoid fever?

Correct AnswerverifiedShow Answer

In secondary endosymbiosis,a(n) became endosymbiotic in a(n) _ .

Correct AnswerverifiedShow Answer

Which of the following is a member of the domain Archaea?

Correct AnswerverifiedShow Answer

are toxic proteins secreted by pathogenic bacteria,whereas are toxic components of the outer membrane of gram- negative pathogens.

Correct AnswerverifiedShow Answer

The term for a close association between organisms of two or more species is

Correct AnswerverifiedShow Answer

Eukaryotes are prokaryotes.

Correct AnswerverifiedShow Answer

Evidence for the relatively close relationship of archaea to eukaryotes includes

Correct AnswerverifiedShow Answer

In what way does the green alga Ulva resemble land plants?

Correct AnswerverifiedShow Answer

Unlike archaean and eukaryote cell walls,bacterial cell walls contain a unique substance called

Correct AnswerverifiedShow Answer

An unknown bacterial species is recovered from a sick patient's digestive tract.It has a membrane outside the cell wall that contains toxic lipids.This observation indicates

Correct AnswerverifiedShow Answer

Which of the following groups includes the protists that reside within the cells of corals?

Correct AnswerverifiedShow Answer

Many species of which protist group have modified mitochondria that lack functional electron transport chains?

Correct AnswerverifiedShow Answer

One difference between gram- positive and gram- negative bacteria is

Correct AnswerverifiedShow Answer

Which of the following options lists the events of protist evolution in the correct order,according to current science?

Correct AnswerverifiedShow Answer

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