Exam 6: An Introduction to the Viruses

A) Present when the virus is in lysogeny
B) Formed when viral DNA enters the bacterial chromosome
C) Replicated with host DNA and passed on to progeny
D) Cause lysis of host cells
E) Occur when temperate phages enter host cells

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A) caused by a chronic latent virus.
B) initiated by an oncogenic virus.
C) caused by a viroid.
D) a spongiform encephalopathy of humans.
E) also called "mad cow disease."

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D

A) initiates lysis of the host.
B) includes DNA from the previous host.
C) is replicated in the cytoplasm.
D) is replicated in the nucleus.

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A) The nucleocapsid is formed.
B) New viral nucleic acid is formed.
C) Viral spikes insert in host cell membrane.
D) The nucleocapsid is formed and viral spikes insert in host cell membrane.
E) The viral envelope and the host cell membrane fuse.

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A) adsorption
B) penetration
C) uncoating
D) synthesis
E) assembly

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A) Bacterial cells are typically between 1,000-10,000 nm and pass through the filter, whereas most viruses are between 20 and 200 nm and are therefore blocked.
B) Bacterial cells are typically between 1-10 $\mu$ m and pass through the filter, whereas most viruses are between 20 and 200 nm and are therefore blocked.
C) Bacterial cells are typically between 1-10 $\mu$ m and are blocked by the filter, whereas most viruses are between 20 and 200 nm and therefore pass through.
D) Bacterial cells are typically between 1-10 nm and are blocked by the filter, whereas most viruses are between 20 and 200 $\mu$ m and therefore pass through.

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A) include the poxviruses
B) infect Escherichia coli cells
C) enter host cells by engulfment
D) have helical capsids

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B

A) penetration, uncoating, synthesis, adsorption, assembly, and release.
B) uncoating, penetration, synthesis, assembly, absorption, and release.
C) adsorption, penetration, uncoating, synthesis, assembly, and release.
D) assembly, synthesis, uncoating, release, penetration, and adsorption.
E) adsorption, release, synthesis, uncoating, assembly, and penetration.

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A) glycoproteins
B) antibodies
C) complement proteins
D) antigens

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A) is identical to the host plasma membrane.
B) is only composed of host endomembrane.
C) does not contain spikes.
D) is obtained by viral budding or exocytosis.
E) makes the virus very susceptible to drug therapy.

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A) Tetrahedral
B) Complex
C) Helical
D) Icosahedron

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A) Live lab animals
B) Embryonated bird eggs
C) Primary cell cultures
D) Continuous cell cultures
E) All of the choices will support viral cultivation.

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A) Primary
B) Secondary
C) Temperate
D) Temporary
E) Transformed

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A) also called viroids.
B) dependent on other viruses for replication.
C) the cause of spongiform encephalopathies.
D) significant pathogens of plants.

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A) viruses range in size between 20-200 nm and are much larger than bacterial cells.
B) viruses have a much greater size range; between 22 nm and 1000 nm.
C) all viruses are 22 nm.
D) viruses are larger and are blocked by sterilizing filters.

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