Question 1

Naked strands of RNA not covered by a capsid are

Accepted Answer

A)   viroids.
B)   archaea.
C)   prions.
D)   retroviruses.
E)   viruses.F) B) and E)
G) A) and E)

Question 2

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) B) and E)
G) D) and E)

Question 3

A viroid is a naked,infectious _____ molecule.

Accepted Answer

A)   protein
B)   DNA
C)   RNA
D)   fatty acid
E)   enzymeF) A) and B)
G) C) and D)

Question 4

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) B) and D)
G) A) and D)

Question 5

Which is the correct order of events in the lytic cycle of a bacteriophage?

Accepted Answer

A)   attachment - penetration - biosynthesis - maturation - release
B)   integration - penetration - biosynthesis - maturation - release
C)   attachment - integration - biosynthesis - maturation - release
D)   attachment - biosynthesis - maturation - release
E)   penetration - attachment - biosynthesis - release - maturationF) A) and C)
G) A) and B)

Question 6

Retroviruses

Accepted Answer

A)   contain DNA.
B)   contain reverse transcriptase.
C)   produce RNA from DNA.
D)   only invade plants.
E)   produce protein directly from DNA.F) B) and C)
G) D) and E)

Question 7

Which of these is mismatched?

Accepted Answer

A)   malaria - protozoan
B)   AIDS - virus
C)   kuru - prion
D)   tetanus - bacterium
E)   food poisoning - archaeaF) A) and E)
G) None of the above

Question 8

What evidence supports the idea that archaea are more closely related to eukaryotes rather 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) B) and C)
G) A) and E)

Question 9

Algae are commonly grouped by their type of

Accepted Answer

A)   motility.
B)   sexual reproduction.
C)   pigment.
D)   habitat.
E)   feeding.F) B) and E)
G) D) and E)

Question 10

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 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) C) and E)
G) B) and D)

Question 11

Cyanobacteria are important producers as

Accepted Answer

A)   photoautotrophs.
B)   saprotrophs.
C)   chemoautotrophs.
D)   saproautotrophs.
E)   photoheterotrophs.F) C) and D)
G) A) and B)

Question 12

Support for the endosymbiotic hypothesis is provided by all of the following EXCEPT

Accepted Answer

A)   double membranes around mitochondria and chloroplasts.
B)   mitochondria and chloroplasts have their own genomes.
C)   mitochondria and chloroplasts can synthesize proteins.
D)   mitochondria and chloroplast ribosomes are encoded by genes that are very similar to bacterial ribosome genes.
E)   mitochondria and chloroplasts contribute to different metabolic processes in the eukaryotic cell.F) A) and B)
G) A) and C)

Question 13

The idea that mitochondria may have resulted when a nucleated cell engulfed aerobic bacteria is known as the

Accepted Answer

A)   endosymbiotic hypothesis.
B)   chemiosmotic theory.
C)   Lyon hypothesis.
D)   theory of evolution by means of acquired characteristics.
E)   theory of acquisition of organelles.F) B) and E)
G) None of the above

Question 14

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) B) and D)
G) All of the above

Question 15

Which sporozoan characteristic is most consistent with a parasitic lifestyle?

Accepted Answer

A)   lack of motility
B)   chemoheterotrophism
C)   unicellular
D)   lack of light-absorbing pigment
E)   eukaryoticF) B) and D)
G) B) and E)

Question 16

What evidence helps supports the endosymbiosis theory?

Accepted Answer

A)   a single membrane around the nucleus within a cell
B)   a double membrane surrounding the nucleus within a cell
C)   a single membrane surrounding the mitochondria
D)   a single membrane surrounding the chloroplast
E)   a double membrane surrounding the mitochnodria and chloroplastF) A) and C)
G) B) and C)

Question 17

Which species are representatives of the green algae?

Accepted Answer

A)   Diatoms, Volvox, and Spirogyra
B)   Coralline algae, Volvox, and Spirogyra
C)   Chlamydomonas, Volvox, and Spirogyra
D)   Chlamydomonas, Volvox, and Coralline
E)   Diatoms, Chlamydomonas, and Volvox,F) B) and E)
G) B) and D)

Question 18

The _____ of a virus is enclosed by a _____ capsid.

Accepted Answer

A)   nucleic acid; protein
B)   membrane; protein
C)   nucleic acid; membrane
D)   protein; nucleic acid
E)   RNA; DNAF) A) and B)
G) B) and E)

Question 19

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) B) and C)
G) C) and D)

Question 20

The genetic material of a bacterium 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

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

The _____ of a virus is enclosed by a _____ capsid.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Retroviruses

Correct AnswerverifiedShow Answer

A viroid is a naked,infectious _____ molecule.

Correct AnswerverifiedShow Answer

The idea that mitochondria may have resulted when a nucleated cell engulfed aerobic bacteria is known as the

Correct AnswerverifiedShow Answer

Algae are commonly grouped by their type of

Correct AnswerverifiedShow Answer

Naked strands of RNA not covered by a capsid are

Correct AnswerverifiedShow Answer

Cyanobacteria are important producers as

Correct AnswerverifiedShow Answer

Which of these is mismatched?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which species are representatives of the green algae?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which is the correct order of events in the lytic cycle of a bacteriophage?

Correct AnswerverifiedShow Answer

What evidence helps supports the endosymbiosis theory?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which sporozoan characteristic is most consistent with a parasitic lifestyle?

Correct AnswerverifiedShow Answer

Which statement about bacteria is incorrect?

Correct AnswerverifiedShow Answer

Support for the endosymbiotic hypothesis is provided by all of the following EXCEPT

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 genetic material is copied whenever the host reproduces.Which viral replication cycle is described here?

Correct AnswerverifiedShow Answer

The genetic material of a bacterium can include

Correct AnswerverifiedShow Answer

The _ of a virus is enclosed by a _ capsid.

Correct Answer
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