Chapter 25 Microbiology
- 1.Virus morphology does not include which of the following characteristics?
- A.
Size
- B.
Shape
- C.
presence or absence of an envelope
- D.
Host range
- 2.Which of the following uses dsRNA as the genome?
- A.
Parvovirus
- B.
Bunyavirus
- C.
Reovirus
- D.
Poxvirus
- 3.Which of the following is(are) used in the classification of animal viruses?
- A.
Virion morphology
- B.
genome structure
- C.
Genetic relatedness
- D.
All of the choices
- 4.The tails of some bacteriophage
- A.
include a contractile sheath.
- B.
rotate like flagella to drive the phage genome into the cytoplasm of the host.
- C.
Exhibit oar like motion that drives the phage genome into the cytoplasm of the host.
- D.
None of the choices
- 5.Late mRNA products in T4 phage include
- A.
Phage structural proteins.
- B.
Proteins that help with phage assembly without becoming part of the virion.
- C.
Proteins involved in cell lysis and phage release.
- D.
All of the above
- 6.Viruses infecting algae have never been detected.
- A.
True
- B.
False
- 7.Which of the following represent(s) the way(s) in which enveloped viruses acquire their envelopes?
- 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.
- 8.Unlike most enveloped viruses, herpes viruses involve the host __________ membrane in the formation of their envelope.
- A.
Plasma
- B.
Nuclear
- C.
Mitochondrial
- D.
None of these
- 9.The most common type of molecule found on the surface of animal viruses for interacting with host cell receptors is a(n)
- A.
Lipoprotein
- B.
Glycoprotein
- C.
Phosphoprotein
- D.
Teichoic acid
- 10.Which of the following does not use RNA as the genome?
- A.
Poxvirus
- B.
Poliovirus
- C.
Influenza virus
- D.
Rabies virus
- 11.The largest viruses known are the
- A.
Herpes viruses
- B.
Hepadnaviruses
- C.
Adenoviruses
- D.
Mimiviruses
- 12.A __________ infection is one in which the virus quits reproducing and remains dormant for a period before becoming active again.
- A.
Persistent
- B.
Latent
- C.
Slow virus
- D.
None of these
- 13.In which of the following stages of the viral infectious cycle do enveloped viruses usually acquire their envelopes?
- A.
Penetration
- B.
Component biosynthesis
- C.
Assembly
- D.
Release
- 14.For which of the following DNA viruses do(es) DNA replication occur in the cytoplasm rather than in the nucleus?
- A.
Poxviruses
- B.
Herpes viruses
- C.
Adenoviruses
- D.
DNA replication occurs in the nucleus for all of these.
- 15.A bacterium carrying a dormant phage inserted in the chromosome is called a __________.
- 16.Bacteriophage T4 blocks transcription of host genes using an enzyme that transfers an ______ from NAD onto the alpha subunit of RNA polymerase.
- 17.__________ is an unusual base found in the DNA of T-even phages.
- 18.________ mRNA is synthesized before replication of the viral nucleic acid.
- 19.For most T-even phages, the nucleic acid enters the host cell but the capsid is left outside.
- A.
True
- B.
False
- 20.Glucosylation of hydroxymethylcytosine residues protects phage T4 DNA from cleavage by bacterial restriction enzymes.
- A.
True
- B.
False
- 21.Once a virus establishes lysogeny, it may not switch to the lytic cycle at some later time.
- A.
True
- B.
False
- 22.In the case of phage lambda, termination of lysogeny and entry into the lytic cycle usually occurs in response to environmental damage to the host DNA.
- A.
True
- B.
False
- 23.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.
True
- B.
False
- 24.Lysogeny always requires integration of the viral genome into the host chromosome.
- A.
True
- B.
False
- 25.Phage T4 gains release from the infected host cell like many other double stranded DNA phages by interfering with the activity of enzymes that synthesize peptidoglycan.
- A.
True
- B.
False
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