Why are transformed cells referred to as immortal

What is the nucleic acid in a virus?

What is the chemical composition of a capsomere?

What is the value of a capsid to a virus?

What is a plaque-forming unit?

Why are viruses grown in eggs and not in culture media?

Why are transformed cells referred to as immortal?

How did VSV infection aect the cells?

What can be found in the cell during biosynthesis and maturation?

What is the result of the lytic cycle?

How does lysogeny dier from the lytic cycle?

How does specialized transduction dier from the lytic cycle?

in which process is the cell actively taking in the virus?

What is the morphology of these viruses?

Why is strand RNA made by picornaviruses and reoviruses? By rhabdoviruses?

Why do viruses with a + strand of RNA make a strand of RNA?

How does the biosynthesis of a retrovirus dier from that of other RNA viruses?

Of what is a viral envelope composed?

How do latent and persistent infections dier?

How do prions dier from viruses?

How do viroids dier from prions?

An example of lysogeny in animals could bea. slow viral infections.b. latent viral infections.c. T-even bacteriophages.d. infections resulting in cell death.e. none of the above

_e ability of a virus to infect an organism is regulated bya. the host species.b. the type of cells.c. the availability of an attachment site.d. cell factors necessary for viral replication.e. all of the above

Which of the following statements is false ?a. Viruses contain DNA or RNA.b. _e nucleic acid of a virus is surrounded by a protein coat.c. Viruses multiply inside living cells using viral mRNA, tRNA, and ribosomes.d. Viruses cause the synthesis of specialized infectious elements.e. Viruses multiply inside living cells

Place the following in the order in which they are found in a host cell: (1) capsid proteins; (2) infective phage particles; (3) phage nucleic acid.a. 1, 2, 3b. 3, 2, 1c. 2, 1, 3d. 3, 1, 2e. 1, 3, 2

Which of the following does not initiate DNA synthesis?a. a double-stranded DNA virus (Poxviridae)b. a DNA virus with reverse transcriptase (Hepadnaviridae)c. an RNA virus with reverse transcriptase (Retroviridae)d. a single-stranded RNA virus (Togaviridae)e. none of the above

A viral species is not dened on the basis of the disease symptoms it causes. _e best example of this isa. polio.b. rabies.c. hepatitis.d. chickenpox and shingles.e. measles.

Prophages and proviruses have been described as being similar to bacterial plasmids. What similar properties do they exhibit? How are they dierent?

A 40-year-old man who was seropositive for HIV experienced abdominal pain, fatigue, and low-grade fever (38C) for 2 weeks. A chest X-ray examination revealed lung inltrates. Gram and acid-fast stains were negative. A viral culture revealed the cause of his symptoms: a large, enveloped polyhedral virus with double-stranded DNA. What is the disease? Which virus causes it? Why was a viral culture done aer the Gram and acid-fast stain results were obtained?

A newborn female developed extensive vesicular and ulcerative lesions over her face and chest. What is the most likely cause of her symptoms? How would you determine the viral cause of this disease without doing a viral culture?

By May 14, two people living in the same household had died within 5 days of each other. _eir illnesses were characterized by abrupt onset of fever, muscle pain, headache, and cough, followed by the rapid development of respiratory failure. By the end of the year, 36 cases of this disease, with a 50% mortality rate, had been conrmed. A member of the Orthomyxoviridae, Bunyaviridae, or Adenoviridae could cause this disease. Dierentiate among these families by method of transmission, morphology, nucleic acid, and type of replication. _e reservoir for this disease is mice. Name the disease. (Hint: Refer to Chapter 23.