Question 1

Cell-like structures that may have resulted from macromolecular self-assembly are referred to as

Accepted Answer

A)   prokaryotes.
B)   protocells.
C)   protoypes.
D)   archaea.
E)   protists.F) A) and B)
G) A) and C)

Question 2

Which statement about bacteria is incorrect?

Accepted Answer

A)   All bacteria are pathogenic to humans.
B)   Bacteria are prokaryotes.
C)   Most bacteria are chemoheterotrophs.
D)   Bacterial cells reproduce by binary fission.
E)   A bacterial cell has one chromosome.F) All of the above
G) None of the above

Question 3

A researcher infects a bacterium with a bacteriophage and notices that the infection does not immediately bring about the destruction of the host cell. Instead, the phage's genetic material is copied whenever the host reproduces. Which viral replication cycle is described here?

Accepted Answer

A)   integration cycle
B)   lysogenic cycle
C)   biosynthetic cycle
D)   lytic cycle
E)   emergence cycleF) A) and B)
G) D) and E)

Question 4

You take a large sample of soil and put it all into individual pots. You then divide the pots into two groups. In the first group, every pot of soil has been sterilized, and thus contains no bacteria. In the second group, none of the pots of soil have been sterilized. You plant soybean seeds in all the pots. What would you expect to see as the seeds sprout and grow?

Accepted Answer

A)   The plants growing in the sterile soil are bigger because they have not been exposed to any bacteria.
B)   The plants growing in the non-sterile soil are bigger because they have mutualistic associations with nitrogen-fixing bacteria.
C)   The plants growing in the sterile soil are bigger because they do not have to compete with nitrogen-fixing bacteria in order to obtain usable nitrogen.
D)   The plants growing in the non-sterile soil are bigger because saprotrophic bacteria produce nutrients for them.
E)   There is no difference in size between the plants growing in the sterile soil and those in the non-sterile soil.F) A) and E)
G) C) and E)

Question 5

Why don't new biological macromolecules form abiotically from nonliving matter on the Earth today?

Accepted Answer

A)   The special environmental conditions that are required do not exist.
B)   There are not enough of the various elements needed.
C)   There is not enough available energy.
D)   There is no need for biological macromolecules.
E)   Biological macromolecules do arise abiotically but are quickly consumed by organisms.F) A) and C)
G) A) and B)

Question 6

Which of the following is not caused by an emerging virus?

Accepted Answer

A)   acquired immunodeficiency syndrome AIDS) 
B)   chickenpox
C)   bird flu
D)   ebola
E)   severe acute respiratory syndrome SARS) F) B) and E)
G) B) and D)

Question 7

One group of protozoans which are nonmotile, produce spores, and have disease-causing species is the

Accepted Answer

A)   foraminiferans.
B)   trypanosomes.
C)   sporozoans.
D)   amoeboids.
E)   radiolarians.F) None of the above
G) B) and E)

Question 8

Which group of algae will have calcium carbonate within their cell walls?

Accepted Answer

A)   red algae
B)   green algae
C)   brown algae
D)   diatoms
E)   filamentous algaeF) None of the above
G) A) and D)

Question 9

Which of the following statements regarding bacterial endospores is false?

Accepted Answer

A)   Endospores can survive in extremely harsh environments.
B)   Within an endospore is a copy of the bacterial chromosome.
C)   An endospore contains a small amount of cytoplasm material.
D)   Endospores can survive for very long periods of time.
E)   Endospores are reproductive structures.F) C) and D)
G) A) and E)

Question 10

Which of the following is not a similarity that protozoans have to animals?

Accepted Answer

A)   Protozoans are chemoheterotrophs.
B)   Most protozoans have some form of locomotion.
C)   Protozoans are eukaryotes.
D)   Protozoans were once classified as animals.
E)   Protozoans are able to photosynthesize.F) A) and C)
G) B) and E)

Question 11

Viroids and prions are alike in that both are infectious

Accepted Answer

A)   cell types.
B)   proteins.
C)   molecules.
D)   DNA.
E)   RNA.F) B) and E)
G) A) and B)

Question 12

Which of the following statements is not true of all viruses?

Accepted Answer

A)   Viruses have an inner core of nucleic acid.
B)   Viruses have a protein capsid.
C)   Viruses are obligate intracellular parasites.
D)   Viruses have envelopes.
E)   Viral genomes may consist of either DNA or RNA.F) D) and E)
G) A) and E)

Question 13

Which of these occurs during the bacteriophage lysogenic cycle but not the lytic cycle?

Accepted Answer

A)   attachment
B)   penetration
C)   integration
D)   biosynthesis
E)   maturationF) A) and E)
G) None of the above

Question 14

African sleeping sickness is caused by a

Accepted Answer

A)   trypanosome.
B)   sporozoan.
C)   prion.
D)   bacterium.
E)   virus.F) D) and E)
G) B) and E)

Question 15

What evidence supports the idea that archaea are more closely related to eukaryotes than to bacteria?

Accepted Answer

A)   Archaea and eukaryotes initiate transcription in the same fashion.
B)   Archaea and eukaryotes both have cell walls with peptidoglycan.
C)   Archaea and eukaryotes share some ribosomal proteins and have similar types of tRNA.
D)   Archaea and eukaryotes initiate transcription in the same fashion, share some ribosomal proteins, and have similar types of tRNA.
E)   None of the choices support a close relationship between eukaryotes and archaea.F) A) and C)
G) B) and E)

Question 16

Animal viruses that have an envelope enter cells by

Accepted Answer

A)   injecting their nucleic acid into the cell's cytoplasm.
B)   fusing with the plasma membrane.
C)   endocytosis.
D)   plasmolysis.
E)   either fusing with the plasma membrane or endocytosis.F) C) and D)
G) A) and E)

Question 17

Which of these is mismatched?

Accepted Answer

A)   malaria - protozoan
B)   AIDS - virus
C)   kuru - prion
D)   tetanus - bacterium
E)   food poisoning - archaeaF) B) and D)
G) B) and C)

Question 18

A bacteria's genetic material can include

Accepted Answer

A)   a circular chromosome.
B)   plasmids.
C)   latent bacteriophage DNA.
D)   a circular chromosome plus plasmids.
E)   a circular chromosome, plasmids, and latent bacteriophage DNA.F) A) and B)
G) All of the above

Question 19

Which of the following groups contains no photosynthetic organisms?

Accepted Answer

A)   protists
B)   bacteria
C)   archaea
D)   zooflagellates
E)   prokaryotesF) A) and D)
G) A) and E)

Question 20

What is the main structural difference between a virus and a viroid?

Accepted Answer

A)   Viroids do not have a capsid covering.
B)   Viruses do not have a capsid covering.
C)   Viroids contain DNA, while viruses do not.
D)   Viruses contain RNA, while viroids do not.
E)   There is no structural difference between the two.F) A) and E)
G) C) and D)

Exam 17: The Microorganisms: Viruses, Bacteria, and Protists

Which of the following is not caused by an emerging virus?

Correct Answer
verified

What evidence supports the idea that archaea are more closely related to eukaryotes than to bacteria?

Correct Answer
verified

Which statement about bacteria is incorrect?

Correct Answer
verified

Viroids and prions are alike in that both are infectious

Correct Answer
verified

Animal viruses that have an envelope enter cells by

Correct Answer
verified

Which of the following groups contains no photosynthetic organisms?

Correct Answer
verified

Which of the following statements is not true of all viruses?

Correct Answer
verified

Correct Answer
verified

Cell-like structures that may have resulted from macromolecular self-assembly are referred to as

Correct Answer
verified

Which of these occurs during the bacteriophage lysogenic cycle but not the lytic cycle?

Correct Answer
verified

African sleeping sickness is caused by a

Correct Answer
verified

Which group of algae will have calcium carbonate within their cell walls?

Correct Answer
verified

Which of these is mismatched?

Correct Answer
verified

A researcher infects a bacterium with a bacteriophage and notices that the infection does not immediately bring about the destruction of the host cell. Instead, the phage's genetic material is copied whenever the host reproduces. Which viral replication cycle is described here?

Correct Answer
verified

Why don't new biological macromolecules form abiotically from nonliving matter on the Earth today?

Correct Answer
verified

What is the main structural difference between a virus and a viroid?

Correct Answer
verified

A bacteria's genetic material can include

Correct Answer
verified

Which of the following is not a similarity that protozoans have to animals?

Correct Answer
verified

Which of the following statements regarding bacterial endospores is false?

Correct Answer
verified

One group of protozoans which are nonmotile, produce spores, and have disease-causing species is the

Correct Answer
verified

Exam 17: The Microorganisms: Viruses, Bacteria, and Protists

Which of the following is not caused by an emerging virus?

Correct AnswerverifiedShow Answer

What evidence supports the idea that archaea are more closely related to eukaryotes than to bacteria?

Correct AnswerverifiedShow Answer

Which statement about bacteria is incorrect?

Correct AnswerverifiedShow Answer

Viroids and prions are alike in that both are infectious

Correct AnswerverifiedShow Answer

Animal viruses that have an envelope enter cells by

Correct AnswerverifiedShow Answer

Which of the following groups contains no photosynthetic organisms?

Correct AnswerverifiedShow Answer

Which of the following statements is not true of all viruses?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Cell-like structures that may have resulted from macromolecular self-assembly are referred to as

Correct AnswerverifiedShow Answer

Which of these occurs during the bacteriophage lysogenic cycle but not the lytic cycle?

Correct AnswerverifiedShow Answer

African sleeping sickness is caused by a

Correct AnswerverifiedShow Answer

Which group of algae will have calcium carbonate within their cell walls?

Correct AnswerverifiedShow Answer

Which of these is mismatched?

Correct AnswerverifiedShow Answer

A researcher infects a bacterium with a bacteriophage and notices that the infection does not immediately bring about the destruction of the host cell. Instead, the phage's genetic material is copied whenever the host reproduces. Which viral replication cycle is described here?

Correct AnswerverifiedShow Answer

Why don't new biological macromolecules form abiotically from nonliving matter on the Earth today?

Correct AnswerverifiedShow Answer

What is the main structural difference between a virus and a viroid?

Correct AnswerverifiedShow Answer

A bacteria's genetic material can include

Correct AnswerverifiedShow Answer

Which of the following is not a similarity that protozoans have to animals?

Correct AnswerverifiedShow Answer

Which of the following statements regarding bacterial endospores is false?

Correct AnswerverifiedShow Answer

One group of protozoans which are nonmotile, produce spores, and have disease-causing species is the

Correct AnswerverifiedShow Answer

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