Chapter 13

Oncogenic viruses.

cause tumors to develop

An example of a latent viral infection is

cold sores.

B) In culture media

5) Which of the following is NOT a method of culturing viruses? A) In laboratory animals B) In culture media C) In embryonated eggs D) In cell culture E) None of the above

B) b Looks like a rocket with legs

9) In Figure 13.1, which structure is a complex virus? A) a B) b C) c D) d E) All of the above

Which of the following is NOT utilized to culture viruses?

culture media

Multiple Choice Question 13.9 Part A - 6 of 35 In the figure (provided - see answer side), which structure is a complex virus? a b c d All of the structures are complex viruses.

B.

A clearing due to phage replication on a confluent "lawn" of bacteria is called a A. Pimple. B. Pock. C. Cell lysis. D. Plaque. E. None of the above.

D

Chapter 13 True/False Question 8 Part A - 26 of 35 Viruses are the only known infectious agents that are obligatory intracellular parasites. True False

False

D) Capsomeres.

10) In Figure 13.1, the structures illustrated are composed of A) DNA. B) RNA. C) DNA or RNA. D) Capsomeres. E) Capsids.

D) Plaque.

11) A clear area against a confluent "lawn" of bacteria is called a A) Phage. B) Pock. C) Cell lysis. D) Plaque. E) Rash.

D) Continuous cell lines can be maintained through an indefinite number of generations.

12) Continuous cell lines differ from primary cell lines in that A) Viruses can be grown in continuous cell lines. B) Continuous cell lines always have to be reisolated from animal tissues. C) Continuous cell lines are derived from primary cell lines. D) Continuous cell lines can be maintained through an indefinite number of generations. E) Continuous cell lines are from human embryos.

E) Release

19) An envelope is acquired during which of the following steps? A) Penetration B) Adsorption C) Uncoating D) Biosynthesis E) Release

C) They cannot reproduce themselves outside a host.

2) Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals? A) They are not composed of cells. B) They are filterable. C) They cannot reproduce themselves outside a host. D) They cause diseases similar to those caused by chemicals. E) They are chemically simple.

B) Cold sores.

21) An example of a latent viral infection is A) Subacute sclerosing panencephalitis. B) Cold sores. C) Influenza. D) Smallpox. E) Mumps.

Chapter 13 - Reading Questions - Question 2 Part A - 18 of 35 Which of the following statements concerning viruses is true? Viruses contain both DNA and RNA, and they undergo binary fusion. Viruses possess enzymes for protein synthesis and ATP generation. Viruses are usually about the same size as bacteria. The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach.

The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach. Correct. Attachment of the virus to the host cell (the first step in the viral life cycle) requires binding of complementary molecules on the virus and host cell.

Chapter 13 Multiple-Choice Question 3 Part A - 28 of 35 Which of the following statements about viral spikes is FALSE? They bind to receptors on the host cell surface. They may cause hemagglutination. They are composed of carbohydrate-protein complexes. They are used for attachment. They are found only on nonenveloped viruses.

They are found only on nonenveloped viruses.

Chapter 13 Multiple-Choice Question 2 Part A - 22 of 35 Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals? They cannot reproduce themselves outside a host. They are chemically simple. They are filterable. They are not composed of cells. They cause diseases similar to those caused by chemicals.

They cannot reproduce themselves outside a host.

Multiple Choice Question 13.2 Part A - 2 of 35 Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals? They are chemically simple. They cause diseases similar to those caused by chemicals. They are not composed of cells. They are filterable. They cannot reproduce themselves outside a host.

They cannot reproduce themselves outside a host.

Chapter 13 True/False Question 10 Part A - 27 of 35 Most drugs that interfere with viral multiplication also interfere with host cell function. True False

True

Chapter 13 True/False Question 6 Part A - 25 of 35 Dogs do not get measles because their cells lack the correct receptor sites for that virus. True False

True

Chapter 13 Multiple-Choice Question 1 Part A - 21 of 35 How do all viruses differ from bacteria? Viruses are not composed of cells. Viruses are filterable. Viruses do not reproduce. Viruses do not have any nucleic acid. Viruses are obligate intracellular parasites.

Viruses are not composed of cells.

Multiple Choice Question 13.1 Part A - 1 of 35 How do all viruses differ from bacteria? Viruses do not reproduce. Viruses are filterable. Viruses do not have any nucleic acid. Viruses are not composed of cells. Viruses are obligate intracellular parasites.

Viruses are not composed of cells.

Chapter 13 Multiple-Choice Question 33 Part A - 23 of 35 Which of the following statements about viruses is FALSE? Viruses have genes. Viruses contain DNA or RNA but never both. Viruses use their own catabolic enzymes. Viruses contain a protein coat. Viruses use the anabolic machinery of the cell.

Viruses use their own catabolic enzymes.

Multiple Choice Question 13.33 Part A - 3 of 35 Which of the following statements about viruses is FALSE? Viruses use the anabolic machinery of the cell. Viruses use their own catabolic enzymes. Viruses have genes. Viruses contain DNA or RNA but never both. Viruses contain a protein coat.

Viruses use their own catabolic enzymes.

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

budding

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

latent viruses.

Chapter 13 Multiple-Choice Question 7 Part A - 33 of 35 The definition of lysogeny is attachment of a phage to a cell. the period during replication when virions are not present. phage DNA is incorporated into host cell DNA. when the burst time takes an unusually long time. lysis of the host cell due to a phage.

phage DNA is incorporated into host cell DNA.

A viruss ability to infect an animal cell depends primarily upon the

presence of receptor sites on the cell membrane.