18. Viruses, Viroids, & Prions

Compare influenzavirus A 2009 (H1N1) to the 1918–1919 pandemic influenzavirus.

Which of the following viruses cause most colds?

a. Rhinoviruses

b. Parainfluenza viruses

c. Pneumoviruses

d. Bunyaviruses

A young mother who has hepatitis B is under your care. Your main concern is to prevent the spread of the virus from infected cells to healthy ones. You would recommend:

a. Acyclovir

b. Retrovir

c. Interferon

d. Valtrex

Reoviruses, such as rotaviruses and coltiviruses, are unique in ___________.

a. Being naked

b. Having double-stranded RNA

c. Being both arboviruses and zoonotic

d. Having protein spikes

Why do we classify viruses as obligatory intracellular parasites?

When packaged in the virus, the complex of nucleic acid and protein is known as the:

This virus family, normally associated with AIDS, may be useful for gene therapy.

Negri bodies are associated with which of the following?

a. Marburg virus

b. Hantavirus

c. Coltivirus

d. Rabies virus

What do viruses in the families Picornaviridae, Caliciviridae, Astroviridae, Coronaviridae, Togaviridae, Flaviviridae, and Retroviridae have in common?

a. They are arboviruses.

b. They are nonpathogenic.

c. They have positive single-stranded RNA genomes.

d. They have negative single-stranded RNA genomes.

Which of the following statements is false?

a. Viruses contain DNA or RNA.

b. The 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.

An RNA virus with an antisense or negative strand must have which of the following enzymes to replicate?

a. Reverse transcriptase

b. Host DNA polymerase

c. RNA-dependent RNA polymerase

d. Host RNA polymerase

How are viruses specific for their host’s cells?