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BISC 260 > Chapter 27 > Flashcards

Chapter 27 Flashcards

1
Q

Virus morphology does not include which of the following characteristics?…

A

a.size

b.shape

c.presence or absence of an envelope

D.host range

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2
Q

Which of the following uses dsRNA as the genome?…

A

a.parvovirus

b.bunyavirus

C.rotavirus

d.poxvirus

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3
Q

Which of the following is(are) used in the classification of animal viruses?…

A

a.virion morphology

b.genome structure

c.genetic relatedness

D.all of the choices

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4
Q

(T/F) Viruses infecting algae have never been detected.

A

False

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5
Q

Which of the following represent(s) the way(s) in which enveloped viruses acquire their envelopes?….

A

a.Budding through the plasma membrane.

b.Budding through internal cellular membranes.

c.Viral enzymes are responsible for production of the envelope.

D.For some viruses, a is correct; for other viruses, b is correct.

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6
Q

Unlike most enveloped viruses, herpes viruses involve the host __________ membrane in the formation of their envelope…..

A

a.plasma

B.nuclear

c.mitochondrial

d.none of these

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7
Q

The most common type of molecule found on the surface of animal viruses for interacting with host cell receptors is a(n)…..

A

a.lipoprotein.

B.glycoprotein.

c.phosphoprotein.

d.teichoic acid.

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8
Q

Which of the following does not use RNA as the genome?
….

A

A.poxvirus

b.poliovirus

c.influenza virus

d.rabies virus

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9
Q

The largest viruses known are the….

A

a.herpesviruses.

b.hepadnaviruses.

c.adenoviruses.

D.mimiviruses.

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10
Q

A __________ infection is one in which the virus quits reproducing and remains dormant for a period before becoming active again.
….

A

a.persistent

B.latent

c.slow virus

d.none of these

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11
Q

In which of the following stages of the viral infectious cycle do enveloped viruses usually acquire their envelopes?
…

A

a.penetration

b.component biosynthesis

c.assembly

D.release

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12
Q

(T/F) In viral infections involving double-stranded DNA viruses, all of the viral genes are usually expressed prior to the replication of viral nucleic acid.

A

False

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13
Q

(T/F) Parvoviruses are among the simplest known DNA viruses of animals.


A

True

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14
Q

A group of viruses thatcause severe diarrhea, resulting in over 600,000 deaths worldwide annually is the….

A

a.polioviruses.

B.rotaviruses.

c.poxviruses.

d.herpesviruses.

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15
Q

When a _________ enters a host cell, it loses the outermost protein layer and is then referred to by virologists as a double-layered particle (DLP).


A

rotavirus

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16
Q

(T/F) Tobacco mosaicvirus can be transmitted between individual plants by bitinginsects.

A

True

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17
Q

(T/F) One way in which small viruses package more information into a very small genome is to use overlapping genes so that the same base sequence is read in more than one reading frame.


A

True

18
Q

(T/F) Almost all known plant viruses are RNA viruses.

A

True

19
Q

(T/F) Although poliovirus capsids contain several distinct proteins, these are synthesized as a single polypeptide then cleaved by proteases to produce the individual proteins.

A

True

20
Q

Influenza virus adheres to the epithelium of the respiratory system with the aid of _________ and _________ found in its envelope spikes.

A

neuraminidase; hemagglutinin

21
Q

(T/F) Segmented genomes in negative-strand RNA viruses may have evolved from unsegmented ones; they may have been created by the reduction of redundant genetic regions.

A

True

22
Q

The genomes of _____________________ cannot function as mRNA and therefore these viruses must bring at least one RNA-dependent RNA polymerase into the host cell during entry.
….

A

a.positive-strand RNA viruses

b.double-stranded DNA viruses

C.negative-strand RNA viruses

d.single-stranded DNA viruses

23
Q

Retroviruses have a +ssRNA as their genome. In order to complete an infection, they must first make a __________ molecule, which they use to direct the synthesis of mRNA.
…

A

a.dsRNA

B.dsDNA

c.DNA:RNA hybrid
d.-ssRNA

24
Q

Which of the following must bring in a virion-associated RNA replicase when it infects host cells?….

A

a.+ssRNA viruses

B.-ssRNA viruses

c.+dsRNA viruses

d.all of the choices

25
Q

The enzyme used by retroviruses to make a DNA copy of their RNA genome is called….

A

a.RNA polymerase.

b.DNA polymerase.

c.RNA replicase
.
D.reverse transcriptase.

26
Q

Alpha, beta, gamma, and unclassified are the different families for what virus?

A

Herpes

27
Q

What does Herpes target?

A

epithelial or nerve cells

28
Q

Where does latent infections occur?

A

neuronal cells
infectious virus
infection recurs

29
Q

How does herpes infect a cell?

A

fuses with the host cell membrane and their dsDNA enters the nucleus and replicates

30
Q

Assembly and release of herpes?

A

nucleocapsid assembles and leaves
the virus envelope is made in the golgi
leaves

31
Q

In epithelial cells, what protein enters the nucleus with the host cell factor?

A

VP16

32
Q

In neurons, what protein enters with the host cell factor and doesn’t enter the cell?

A

VP16

33
Q

How is rotavirus transmitted?

A

fecal matter

34
Q

What strand cannot act as an mRNA for viral proteins?

A

negative strand

35
Q

How many types of viruses are there for influenza?

A

three: ABC

36
Q

Flu life cycle?

A

enters endosome

virus buds and leaves host and acquires envelope

37
Q

Is polio nonenveloped?

A

yes

38
Q

How is polio transmitted?

A

through digestion

39
Q

What does retrovirus do to ssRNA?

A

converts into dsDNA

40
Q

What does dsDNA serve as a template for?

A

mRNA

BISC 260 (16 decks)

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