2) i m sorry of the following statements provides the most far-reaching support because that the idea that viruses space nonliving chemicals?

A) They space not composed of cells.

You are watching: ________ were first identified in cancer-causing viruses and can induce ________ in infected cells.

B) They are filterable.

C) They can not reproduce themselves outside a host.

D) They cause diseases comparable to those led to by chemicals.

E) They space chemically simple.

3) i beg your pardon of the following statements around viral spikes is FALSE?

A) They are composed the carbohydrate-protein complexes.

B) castle are used for attachment.

C) lock may cause hemagglutination.

D) They tie to receptor on the host cell surface.

E) lock are uncovered only top top nonenveloped viruses.

4) which of the adhering to is NOT used as a criterion to classify viruses?

A) biochemical tests

B) morphology

C) nucleic acid

D) size

E) variety of capsomeres

5) i m sorry of the following is NOT made use of to culture viruses?

A) activities animals

B) culture media

C) embryonated eggs

D) pet cell cultures

E) bacterial cultures

6) Bacteriophages and also animal viruses execute NOT differ considerably in which one of the following steps?

A) attachment

B) penetration

C) uncoating

D) biosynthesis

E) release

7) The meaning of lysogeny is

A) phage DNA is incorporated into organize cell DNA.

B) lysis of the organize cell due to a phage.

C) the period during replication as soon as virions are not present.

D) as soon as the explode time takes an uncommonly long time.

E) attachments of a phage come a cell.

8) A viroid is a(n)

A) complete, infectious virus particle.

B) contagious piece of RNA there is no a capsid.

C) capsid without main point acid.

D) provirus.

E) transmittable protein.


9) In number 13.1, which structure is a facility virus?

A) a B) b C) c D) d E) all of the structures are complicated viruses.

10) The structures shown in figure 13.1 space composed of



C) DNA or RNA.

D) Capsomeres.

E) viroids.

11) A clear area against a confluent "lawn" that bacteria is dubbed a

A) phage.

B) pock.

C) cell lysis.

D) plaque.

E) rash.

12) constant cell lines differ from main cell currently in that

A) viruses have the right to be get an impressive in continuous cell lines.

B) constant cell lines constantly have to be re-isolated from pet tissues.

C) consistent cell lines are acquired from primary cell lines.

D) constant cell lines have the right to be preserved through an indefinite number of generations.

E) constant cell lines are from human embryos.

13) i m sorry of the complying with is crucial for replication the a prion?


B) DNA polymerase

C) lysozyme

D) PrPSc


14) A persistent infection is one in which

A) the virus continues to be in equilibrium v the host without causing a disease.

B) famous replication is unusually slow.

C) the an illness process occurs gradually over a long period.

D) organize cells are slowly lysed.

E) hold cells room transformed.

15) i beg your pardon of the adhering to statements is FALSE?

A) A prophage is phage DNA put into a bacter chromosome.

B) A prophage have the right to "pop" out of the chromosome.

C) Prophage genes room repressed through a repressor protein coded for by the prophage.

D) A prophage may an outcome in new properties of the organize cell.

E) The prophage renders the hold cell immune to infection by other phages.

16) Lysogeny can an outcome in every one of the following EXCEPT

A) immune to reinfection by the exact same phage.

B) salvation of new characteristics by the hold cell.

C) immune to reinfection by any kind of phage.

D) committed transduction.

E) phage conversion.

17) i beg your pardon of the adhering to would it is in the very first step in biosynthesis of a virus v a - (minus) strand that RNA?

A) synthetic of DNA from an RNA template

B) synthetic of double-stranded RNA from an RNA template

C) synthetic of double-stranded RNA native a DNA template

D) transcription of mRNA indigenous DNA

E) synthesis of DNA indigenous a DNA template

18) An infectious protein is a

A) bacteriophage.

B) prion.

C) retrovirus.

D) viroid.

E) papovavirus.

19) an envelope is acquired during which that the adhering to steps?

A) penetration

B) adsorption

C) uncoating

D) biosynthesis

E) release

20) i beg your pardon of the adhering to statements is not true of lysogeny?

A) the can offer infected pathogens the genetic information for toxin production.

B) Prophage is placed into the hold genome.

C) riot cycle might follow lysogeny.

D) the is a "silent" infection; the virus does not replicate.

E) It causes lysis of organize cells.

21) an instance of a implicitly viral infection is

A) subacute sclerosing panencephalitis.

B) cold sores.

C) influenza.

D) smallpox.

E) mumps.

22) A virus"s capacity to infect an pet cell depends mainly upon the

A) host cell"s ability to phagocytize famous particles. B) existence of receptor sites on the cell membrane. C) type of viral main point acid. D) enzymatic activity of a hold cell. E) presence of pili on the hold cell wall.

23) i think you have isolated an unknown virus. This virus has a single, optimistic sense strand that RNA, and possesses an envelope. Come which team does that most likely belong?

A) herpesvirus

B) picornavirus

C) retrovirus

D) togavirus

E) papovavirus

24) The mechanism through which an covering virus pipeline a organize cell is called

A) transduction.

B) budding.

C) abduction.

D) lysogeny.

E) penetration.

25) The most conclusive proof that viruses reason cancers is provided by

A) recognize oncogenes in viruses.

B) the visibility of antibodies versus viruses in cancer patients.

C) cancer adhering to injection of cell-free filtrates.

D) dealing with cancer through antibodies.

E) some liver cancer patients having had hepatitis.

26) Bacteriophages derive all of the following from the organize cell EXCEPT

A) lysozyme.

B) tRNA.

C) amino acids.

D) nucleotides.


27) bacteriophage replication differs from pet virus replication due to the fact that only bacter replication involves

A) adsorption to certain receptors.

B) assembly of famous components.

C) replication of viral main point acid.

D) injection of naked nucleic acid right into the hold cell.

E) lysis that the organize cell.

28) Generally, in an infection caused by a DNA-containing virus, the host pet cell supplies all of the adhering to EXCEPT

A) RNA polymerase.

B) nucleotides.

C) DNA polymerase.

D) tRNA.

E) no one of the answers are correct; all of these are offered by the host animal cell.

29) i m sorry of the complying with places these items in the exactly order for DNA-virus replication?

mature DNA synthesis transcription Translation A) 1; 2; 3; 4 B) 2; 3; 4; 1 C) 3; 4; 1; 2 D) 4; 1; 2; 3 E) 4; 3; 2; 1

30) A viral types is a team of viruses that

A) has the very same morphology and also nucleic acid.

B) has actually the same genetic information and ecological niche.

C) infects the very same cells and cause the same disease.

D) can not be defined.

31) Viruses that use reverse transcriptase belong come the virus familiesA) Retroviridae and Picornaviridae.B) Herpesviridae and Retroviridae.C) Hepadnaviridae and Retroviridae.D) Herpesviridae and Poxviridae.E) Rhabdoviridae and Herpesviridae.

32) DNA make from one RNA theme will be integrated into the virus capsid of

A) Retroviridae.

B) Herpesviridae.

C) Hepadnaviridae.

D) bacter families.

E) influenzavirus.

33) i beg your pardon of the following statements about viruses is FALSE?

A) Viruses save DNA or RNA yet never both.

B) Viruses save a protein coat.

C) Viruses use the anabolic machinery of the cell.

D) Viruses usage their own catabolic enzymes.

E) Viruses have genes.

34) A riot virus has actually infected a patient. Which of the adhering to would ideal describe what is happening inside the patient?

A) The virus is bring about the death of the infected cell in the patient.

B) The virus is not killing any cells in the host.

C) The virus is combine its main point acid through that that the patient"s cells.

D) The virus is gradually killing the patient"s cells.

E) The virus is infecting cells and also then release only small amounts that virus.

35) some viruses, such as person herpesvirus 1, epidemic a cabinet without causing symptoms. These room called

A) latent viruses.

B) lytic viruses.

C) phages.

D) sluggish viruses.

E) unconventional viruses.


36) assume a patient had chickenpox (human herpesvirus 3) as a child. Which line on the graph in figure 13.2 would show the variety of viruses current in this human as a 60-year-old through shingles (human herpesvirus 3)?

A) a

B) b

C) c

D) d

E) e


37) assume a patient has actually influenza. Throughout which time top top the graph in number 13.2 would certainly the patient show the symptoms of the illness?

A) a

B) b

C) c

D) d

E) e

38) The following steps occur throughout multiplication of herpesviruses. Which is the third step?

A) attachment

B) biosynthesis

C) penetration

D) release

E) uncoating

39) The following steps occur during multiplication the retroviruses. I m sorry is the fourth step?

A) synthetic of double-stranded DNA

B) synthesis of +RNA

C) attachment

D) penetration

E) uncoating

40) Oncogenic viruses

A) reason acute infections.

B) room genetically unstable.

C) reason tumors come develop.

D) space lytic viruses that kill the organize cell.

E) have actually no effect on the host cell.

41) Which one of the complying with steps does no occur during multiplication of a picornavirus?

A) synthesis of + strands the RNA

B) synthesis of - strands of RNA

C) synthetic of viral proteins

D) synthetic of DNA

E) none of the answer is correct.

42) i beg your pardon of the adhering to is most likely a product of very early gene?

A) capsid proteins

B) DNA polymerase

C) envelope proteins

D) spike proteins

E) lysozyme

43) many RNA viruses bring which of the complying with enzymes?

A) DNA-dependent DNA polymerase

B) lysozyme

C) RNA-dependent RNA polymerase

D) turning back transcriptase

E) ATP synthase

44) The complying with steps occur throughout biosynthesis of a + strand RNA virus. What is the 3rd step?

A) attachment

B) penetration and uncoating

C) synthesis of - strand RNA

D) synthetic of + strand RNA

E) synthetic of famous proteins

45) What contributes to antigenic change in influenza viruses?

A) global distribution of the virus

B) a segmented genome

C) attachment spikes

D) ease of virus transmission

E) various virus subtypes

46) ________ were an initial identified in cancer-causing viruses and can induce ________ in infected cells.

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A) Herpes viruses; lesions

B) Oncogenes; transformation

C) T antigens; lysis

D) Glycoprotein spikes; syncytia formation

E) Segmented genomes; reassortment

2) A viroid is a fully developed infectious agent created of nucleic acid and also surrounded by a capsid.