Chapter 13 Micro Review

All of the following statements concerning virus taxonomy are true EXCEPT: A.Genus are used in one classification system B.Genus and specific epithet are used in both classification systems. C.Specific epithet are used in both classification system D.Neither Genus or Specific epithet are used in both classification system

B.

All of the following statements concerning viruses are true EXCEPT: A) Viruses never contain both DNA and RNA. B) Viruses enter a cell to complete the replication they have begun extracellularly. C) Some viruses have an outer membrane called an envelope. D) Viral capsids can assume one of three basic shapes. Formed by protein E) Tobacco mosaic virus was the first virus to be discovered and characterized

B.

How are fungal viruses different from viruses that infect other organisms? A) They have only DNA for genetic material. B) They have no extracellular state. C) They have no capsid. D) They cannot pass through a filter. E) They have no intracellular state.

B.

Plaque assays are used for A) evaluating the cancer-causing ability of a virus. B) estimating the number of phages in a culture. C) the study of prions. D) cultivating viruses that cannot be grown any other way. E) counting the number of latent phages in a cell.

B.

The majority of cases of infant diarrhea are caused by what kind of virus? A) dsDNA viruses B) dsRNA viruses-AKA Rota Virus C) +ssRNA viruses D) retroviruses E) -ssRNA viruses

B.

Which of the following would NOT be found as a subcomponent of a bacteriophage? A. icosahedral capsid B. envelope C. DNA D. tail fibers E. base plate

B.

*****All of the following statements are true for animal viruses and bacteriophage EXCEPT: A.bacteriophage can only inject its DNA in bacteria cells though cell wall; can't enter it B.animal cells can get into host cells by phagocytosis or fusion of envelope and bacteriophage cannot C.Biosynthesis D.animal virus can enter through direct penetration E.

C.

All of the following are diseases known to be caused by prions EXCEPT: A.kuru. B.Creutzfeldt-Jakob disease. C.Senile dementia D.scrapie. E.bovine spongiform encephalitis.

C.

Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated? A) +ssRNA viruses B) ssDNA viruses C) -ssRNA viruses D) retroviruses E) dsDNA viruses

C.

All of the following are used in the classification of viruses EXCEPT: A.Family B.Genus C.Order D.Class

D.

All of the following statements are true of lambda phage EXCEPT: A) In lytic phase it fuses with host chromosomes and replicates B) In lysogenic phase it fuses with host chromosome and remains dormant C) In lytic phase it causes cell lysis and releases virus particles D) Both lytic and lysogenic phases occur together

D.

The first person to demonstrate the existence of viruses was A) Stanley B) Rous C) Lacks D) Ivanowsky E) Prusiner

D.

The outermost layer of a virion fulfills which of the following functions of the virus? A) protection B) recognition C) replication D) protection and recognition E) recognition and replication

D.

Which of the following agents is capable of inducing conversion of a prophage back to a lytic phage? A) UV light B) X rays C) presence of +ssRNA D) UV light and X rays E) UV light and +ssRNA

D.

All of the following are produced during the synthesis phase of bacteriophage T4's life cycle EXCEPT: A. An envelope B. DNA polymerase C.Lysozome D.Head capsomeres E. tail components

A.

How is the HIV provirus different from a lambda phage prophage? A) The HIV provirus is integrated permanently into the host cell's DNA. B) All subsequent generations of HIV-infected cells carry the provirus. C) All the offspring of a cell infected with a prophage will contain the virus. D) The HIV provirus is inactive inside the host cell. E) Lambda phage-infected cells produce virus slowly over time.

A.

Put the following stages of a lytic replication cycle in order, from earliest to latest stages: I. Synthesis II. Assembly III. Attachment IV. Release V. Entry A) III, V, I, II, IV B) III, II, V, I, IV C) V, III, II, IV, I D) I, III, V, II, IV E) I, II, III, V, IV

A.

Viruses are primarily classified according to their A) type of nucleic acid. B) type of life cycle. C) number of chromosomes. D) shape. E) size.

A.

Viruses can cause cancer by all of the following EXCEPT: A. lung cancer. B.Pancreatic Cancer C.Breast Cancer D.Brain Cancer E.Testicular Cancer

A.

Why is lysogeny advantageous to a bacteriophage? A) It speeds up the viral infection cycle. B) The genetic material of the bacteriophage can be passed on to future generations of cells. C) It allows the bacteriophage to infect cells it would not normally infect. D) It allows the bacteriophage to destroy the host cell's DNA. E) It enables the bacteriophage to take over the cell.

B.

**Which of the following membranes can give rise to a viral envelope? A) the nuclear membrane B) the cytoplasmic membrane C) the endoplasmic reticulum D) the nuclear and cytoplasmic membranes E) the nuclear and cytoplasmic membranes and the endoplasmic reticulum

E.

Diploid cell cultures and continuous cell cultures differ in which of the following ways? A) longevity B) source of cells C) convenience of use D) longevity and convenience of use E) longevity and source of cells

E.

Host specificty of a virus is due to A) particular genes that it shares with the infected cell. B) the presence of an envelope. C) differences in size between the virus and the host cell. D) the presence or absence of a cell wall on the host cell. E) interactions between viral particle and cellular surface protein

E.

How are prions different from all other known infectious agents A) They cannot reproduce outside a cell. B) They act as slow viruses. C) They cause neurological problems. D) They can be destroyed by incineration. E) They are a protein

E.

Viruses are known to infect all of the following organisms EXCEPT: A) bacteria B) protozoa C) plants D) animals E) All of the above

E.