2) Which of the complying with statements gives the a lot of considerable assistance for the principle that virprovides are nonliving chemicals?

A) They are not composed of cells.

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B) They are filterable.

C) They cannot reproduce themselves outside a organize.

D) They reason illness comparable to those caused by chemicals.

E) They are chemically simple.


3) Which of the adhering to statements around viral spikes is FALSE?

A) They are created of carbohydrate-protein complexes.

B) They are supplied for attachment.

C) They might cause hemagglutination.

D) They bind to receptors on the organize cell surchallenge.

E) They are found only on nonenveloped viroffers.


4) Which of the adhering to is NOT provided as a criterion to classify viruses?

A) biochemical tests

B) morphology

C) nucleic acid

D) size

E) variety of capsomeres


5) Which of the complying with is NOT used to culture viruses?

A) laboratory animals

B) culture media

C) embryonated eggs

D) animal cell cultures

E) bacterial cultures


6) Bacteriophages and also pet virsupplies execute NOT differ significantly in which among 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 hold cell DNA.

B) lysis of the host cell as a result of a phage.

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

D) as soon as the burst time takes an uncommonly lengthy time.

E) attachment of a phage to a cell.


8) A viroid is a(n)

A) complete, contagious virus ppost.

B) transmittable item of RNA without a capsid.

C) capsid without nucleic acid.

D) provirus.

E) infectious protein.


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

A) a B) b C) c D) d E) All of the frameworks are complicated viroffers.
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10) The frameworks illustrated in Figure 13.1 are composed of

A) DNA.

B) RNA.

C) DNA or RNA.

D) Capsomeres.

E) viroids.


11) A clear area against a confluent "lawn" of bacteria is referred to as a

A) phage.

B) pock.

C) cell lysis.

D) plaque.

E) rash.


12) Continuous cell lines differ from primary cell lines in that

A) virprovides have the right to be grown in consistent cell lines.

B) constant cell lines always have to be re-isolated from animal tissues.

C) constant cell lines are derived from primary cell lines.

D) continuous cell lines can be preserved via an indefinite variety of generations.

E) continuous cell lines are from human embryos.


13) Which of the complying with is vital for replication of a prion?

A) DNA

B) DNA polymerase

C) lysozyme

D) PrPSc

E) RNA


14) A persistent infection is one in which

A) the virus remains in equilibrium via the hold without bring about a condition.

B) viral replication is uncommonly sluggish.

C) the condition process occurs gradually over a lengthy period.

D) organize cells are progressively lysed.

E) host cells are transcreated.


15) Which of the complying with statements is FALSE?

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

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

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

D) A prophage might bring about brand-new properties of the hold cell.

E) The prophage provides the host cell immune to infection by other phages.


16) Lysogeny deserve to lead to all of the adhering to EXCEPT

A) immunity to reinfection by the same phage.

B) acquisition of brand-new attributes by the organize cell.

C) immunity to reinfection by any type of phage.

D) specialized transduction.

E) phage convariation.


17) Which of the following would certainly be the initially action in biosynthesis of a virus through a - (minus) strand of RNA?

A) synthesis of DNA from an RNA template

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

C) synthesis of double-stranded RNA from a DNA template

D) transcription of mRNA from DNA

E) synthesis of DNA from a DNA template


18) An infectious protein is a

A) bacteriophage.

B) prion.

C) retrovirus.

D) viroid.

E) papovavirus.


19) An envelope is gained in the time of which of the complying with steps?

A) penetration

B) adsorption

C) uncoating

D) biosynthesis

E) release


20) Which of the complying with statements is NOT true of lysogeny?

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

B) Prophage is put into the organize genome.

C) Lytic cycle may follow lysogeny.

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

E) It reasons lysis of host cells.


21) An instance of a latent 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 relies primarily upon the

A) hold cell"s capability to phagocytize viral pwrite-ups. B) presence of receptor sites on the cell membrane. C) type of viral nucleic acid. D) enzymatic activity of a hold cell. E) existence of pili on the host cell wall.

23) Assume you have isolated an unwell-known virus. This virus has actually a single, positive feeling strand also of RNA, and also possesses an envelope. To which team does it a lot of likely belong?

A) herpesvirus

B) picornavirus

C) retrovirus

D) togavirus

E) papovavirus


24) The mechanism whereby an enveloped virus leaves a host cell is called

A) transduction.

B) budding.

C) abduction.

D) lysogeny.

E) penetration.


25) The a lot of conclusive proof that viruses reason cancers is provided by

A) finding oncogenes in virsupplies.

B) the presence of antibodies against virsupplies in cancer patients.

C) cancer following injection of cell-free filtrates.

D) dealing with cancer via antibodies.

E) some liver cancer patients having had hepatitis.


26) Bacteriophperiods derive all of the following from the hold cell EXCEPT

A) lysozyme.

B) tRNA.

C) amino acids.

D) nucleotides.

E) ATP.


27) Bacteriophage replication differs from pet virus replication bereason just bacteriophage replication involves

A) adsorption to certain receptors.

B) assembly of viral components.

C) replication of viral nucleic acid.

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

E) lysis of the hold cell.


28) Usually, in an infection caused by a DNA-containing virus, the organize pet cell provides all of the adhering to EXCEPT

A) RNA polymerase.

B) nucleotides.

C) DNA polymerase.

D) tRNA.

E) Namong the answers are correct; all of these are supplied by the hold pet cell.


29) Which of the complying with places these items in the correct order for DNA-virus replication?

Maturation 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 species is a team of virprovides that

A) has actually the same morphology and nucleic acid.

B) has actually the exact same genetic information and also environmental niche.

C) infects the same cells and also reason the exact same illness.

D) cannot be identified.


31) Virprovides that use reverse transcriptase belengthy to the virus familiesA) Retroviridae and also Picornaviridae.B) Herpesviridae and Retroviridae.C) Hepadnaviridae and Retroviridae.D) Herpesviridae and also Poxviridae.E) Rhabdoviridae and also Herpesviridae.


32) DNA made from an RNA design template will be included right into the virus capsid of

A) Retroviridae.

B) Herpesviridae.

C) Hepadnaviridae.

D) bacteriophage households.

E) influenzavirus.


33) Which of the complying with statements about virsupplies is FALSE?

A) Viroffers contain DNA or RNA but never both.

B) Virsupplies contain a protein coat.

C) Viroffers usage the anabolic machinery of the cell.

D) Viruses use their own catabolic enzymes.

E) Virsupplies have actually genes.


34) A lytic virus has actually infected a patient. Which of the following would finest describe what is happening inside the patient?

A) The virus is leading to the death of the infected cells in the patient.

B) The virus is not killing any kind of cells in the hold.

C) The virus is incorporating its nucleic acid via that of the patient"s cells.

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

E) The virus is infecting cells and also then releasing just tiny amounts of virus.


35) Some virsupplies, such as human herpesvirus 1, infect a cell without causing symptoms. These are called

A) latent viruses.

B) lytic virprovides.

C) phperiods.

D) slow-moving virprovides.

E) untraditional virprovides.


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36) Assume a patient had actually chickenpox (humale herpesvirus 3) as a kid. Which line on the graph in Figure 13.2 would certainly display the variety of virsupplies current in this perchild as a 60-year-old with shingles (huguy herpesvirus 3)?

A) a

B) b

C) c

D) d

E) e


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37) Assume a patient has actually influenza. Throughout which time on the graph in Figure 13.2 would the patient show the symptoms of the illness?

A) a

B) b

C) c

D) d

E) e


38) The complying with steps happen in the time of multiplication of herpesvirprovides. Which is the 3rd step?

A) attachment

B) biosynthesis

C) penetration

D) release

E) uncoating


39) The adhering to procedures occur in the time of multiplication of retroviroffers. Which is the fourth step?

A) synthesis of double-stranded DNA

B) synthesis of +RNA

C) attachment

D) penetration

E) uncoating


40) Oncogenic viruses

A) cause acute infections.

B) are genetically unstable.

C) reason tumors to build.

D) are lytic viruses that kill the organize cell.

E) have no result on the host cell.


41) Which among the following measures does NOT happen in the time of multiplication of a picornavirus?

A) synthesis of + strands of RNA

B) synthesis of - strands of RNA

C) synthesis of viral proteins

D) synthesis of DNA

E) None of the answers is correct.


42) Which of the complying with is most likely a product of an early gene?

A) capsid proteins

B) DNA polymerase

C) envelope proteins

D) spike proteins

E) lysozyme


43) Many RNA virsupplies bring which of the adhering to enzymes?

A) DNA-dependent DNA polymerase

B) lysozyme

C) RNA-dependent RNA polymerase

D) reverse transcriptase

E) ATP synthase


44) The adhering to measures take place throughout biosynthesis of a + strand RNA virus. What is the third step?

A) attachment

B) penetration and also uncoating

C) synthesis of - strand RNA

D) synthesis of + strand RNA

E) synthesis of viral proteins


45) What contributes to antigenic change in influenza viruses?

A) worldwide circulation of the virus

B) a segmented genome

C) attachment spikes

D) ease of virus transmission

E) various virus subtypes


46) ________ were first identified in cancer-bring about virsupplies and deserve to 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 occurred transmittable agent created of nucleic acid and surrounded by a capsid.