Practice Quiz 13-1

Which of the following is NOT true about viruses?

A) Viruses use their own catabolic enzymes for their metabolism.

B) Viruses use the anabolic machinery of the cell.
C) Viruses contain a protein coat.
D) Viruses contain DNA or RNA but never both.

E) Some viruses have an envelope.

A) Viruses use their own catabolic enzymes for their metabolism.

(virus have no metabolism)

The definition of lysogeny is
A) The period during replication when virions are not present.

B) Phage DNA is incorporated into host cell DNA.
C) When the burst time takes an unusually long time.
D) Lysis of the host cell due to a phage.
E) The process by which a phage attaches to a host cell.

B) Phage DNA is incorporated into host cell DNA.

The enzyme lysozyme is critical for which of the stages of a bacteriophage T4 life cycle?

A) entry and release

B) assembly

C) entry
D) attachment

E) synthesis

A) entry and release

The phenomenon of transduction (Chapter 7!) is associated with which of the stages of a bacteriophage life cycle?

A) assembly

B) attachment

C) release

D) entry

E) synthesis

A) assembly

Why is lysogeny advantageous to a bacteriophage?
A) The genetic material of the phage can be inherited by future generations of cells.

B) It speeds up the viral life cycle.
C) It allows the bacteriophage to infect cells it would not normally infect.
D) It enables the bacteriophage to take over the cell.
E) It allows the bacteriophage to destroy the host cell's DNA.

A) The genetic material of the phage can be inherited by future generations of cells.

All of the following statements concerning virus taxonomy are true EXCEPT:
A) Virus family names are sometimes derived from the name of an important virus within

the family.
B) Latinized names are used for the genus and species names of viruses.
C) Families are the highest taxonomic groups used for all viruses.
D) The ICTV establishes proper taxonomic schemes for virus classification.

E) Currently there are only three orders of viruses.

B) Latinized names are used for the genus and species names of viruses.

(1960s started using English bc it became international language)

A clear area against a confluent "lawn" of bacteria is called a
A) Cell lysis.

B) Plaque.

C) Pock.

D) Phage.

E) Plague.

B) Plaque.

Bacteriophages carry which of the following from one host cell to the next?
A) Amino acids.
B) tRNA.

C) Nucleotides.

D) Lysozyme.

E) Polymerase.

D) Lysozyme

(used in entry and release)

A virus usually infects only certain types of cells due to
A) the speed with which it can enter these cells.
B) differences in size between the virus and the host cell.
C) particular genes that it shares with the infected cell.
D) interactions between viral and cellular surface molecules.

E) the presence or absence of a cell wall on the host cell.

D) interactions between viral and cellular surface molecules.

An envelope is acquired during which of the following steps?
A)Penetration

B)Uncoating

C)Adsorption

D)Release

E)Entry

D) Release

Viral capsids are composed of subunits called __________.

capsomeres

Which of the following would be the first step in biosynthesis of a virus with a - strand of

RNA?

A) Transcription of mRNA from DNA.
B) Synthesis of a +RNA strand from a -RNA template.
C) Synthesis of DNA from an RNA template.
D) Synthesis of double-stranded RNA from a DNA template.

E) Synthesis of a -RNA strand from a +RNA template.

B) Synthesis of a +RNA strand from a -RNA template.

An infectious protein is a

A) Prion

B) Viroid
C) Retrovirus
D) Bacteriophage

E) Protease

A) Prion

Some viruses, such as Human Herpes Virus 1, infect a cell without causing symptoms; these are called

A) Lytic viruses.
B) Slow viruses.
C) Phages.
D) Latent viruses.
E) Unconventional viruses.

D) Latent viruses

An oncogenic RNA virus must have which of the following enzymes?

A) DNA-dependent DNA polymerase
B) Lysozyme
C) Reverse transcriptase

D) RNA polymerase

E) Ribosome

C) Reverse transcriptase

Which of the following types of animal virus has genetic processes that are most like those of the cell?

A) ssDNA viruses

B) +ssRNA viruses

C) -ssRNA viruses

D) dsDNA viruses

E) dsRNA viruses

D) dsDNA viruses

The genome of which of the following types of animal virus can act directly as mRNA?

A) +ssRNA viruses

B) -ssRNA viruses

C) dsRNA viruses

D) retroviruses
E) ssDNA viruses

A) +ssRNA viruses

How do naked animal viruses enter an animal cell?

A) diffusion

B) phagocytosis
C) direct penetration
D) membrane fusion
E) creation of a prophage

C) direct penetration

Which of the following are features associated with SARS-CoV-2?

A) has a +sRNA genome

B) has a -ssRNA genome

C) enveloped
D) A and C only.
E) B and C only.

D) A and C only (has a +sRNA genome and enveloped)

Large changes can occur in the influenza virus because.....
A) there are many different influenza virus strains that can infect different host cells.

B) its genome is segmented.
C) it is released by budding.
D) A and C only.
E) A, B, and C.

E) A, B, and C

(there are many different influenza virus strains that can infect different host cells, its genome is segmented, it is released by budding)

TRUE OR FALSE?

Antigenic shift is the phenomenon where small changes to the antigens of a virus can lead to its ability to evade immune recognition.

False

(this is antigenic DRIFT. Antigenic drift is the phenomenon where small changes to the antigens of a virus can lead to its ability to evade immune recognition)

TRUE OR FALSE:

All human coronaviruses cause serious disease.

False

TRUE OR FALSE:

HPV can cause cancer if it inserts its DNA into several positions in the host genome that lead to changes in cell division of the host cell.

True

__________ is the process of viral capsid removal within the infected cell.

uncoating

Coronaviruses are different than typical RNA viruses because they have ____________________.

proofreading