Chapter 5 Concept Checks & Book Review Questions

A prophage is an early stage in the development of a/an A. bacterial virus B. poxvirus C. lytic virus D. enveloped virus

A

A virus that undergoes lysogeny is a/an A. temperate phage B. intemperate phage C. T-even phage D. animal virus E. DNA virus

A

Clear patches in cell cultures that indicate sites of virus infection are called A. plaques B. pocks C. colonies D. prions

A

The general steps in a viral multiplication cycle are A. adsorption, penetration, synthesis, assembly, and release B. endocytosis, uncaring, replication, assembly, and budding C. adsorption, uncaring, duplication, assembly, and lysis D. endocytosis, penetration, replication, maturation, and exocytosis

A

In general, RNA viruses multiply in the cell ____, and DNA viruses multiply in the cell ____. A. nucleus, cytoplasm B. cytoplasm, nucleus C. vesicles, ribosomes D. ER, nucleolus

B

When phage nucleic acid is incorporated into the nucleic acid of its host cell and is replicated when the host DNA is replicated, this is considered part of which cycle? A. lytic cycle B. virulence cycle C. lysogenic cycle D. cell cycle E. multiplication cycle

C

Which of the following is not an in vivo method of culturing animal viruses? A. embryonated chicken eggs B. guinea pigs C. dog kidney cell culture D. white mice E. All of the choices are in vivo methods.

C. Dog kidney cell culture is an in vitro method.

Creutzfeldt-Jakob disease and Bovine spongiform encephalopathy are caused by prions. Which of the following best describes a prion? A. viral particle B. naked DNA C. infectious protein D. small bacterium E. naked RNA

C. Prions are infectious protein particles

Which of the following best describes viruses? A. heterotrophic B. saprobic C. obligate intracellular parasites D. chemoautotrophic E. photosynthetic

C. Viruses are obligate intracellular parasites because they cannot replicate independently of a host cell.

The nucleic acid of a virus is A. DNA only B. RNA only C. both DNA and RNA D. either DNA or RNA

D

Viruses cannot be cultivated in A. tissue culture B. bird embryos C. live mammals D. blood agar

D

Which of the following is not a type of viral nucleic acid? A. single-stranded DNA B. double-stranded RNA C. double-stranded DNA D. All of the types listed are found in viruses.

D

Put the phases of the life cycle of animal viruses in the correct order: A. assembly B. penetration C. release D. adsorption E. synthesis F. uncoating

D, B, F, E, A, C

Antibiotics are an effective method for treating viral infections. A. True B. False

False. Antibiotics are designed to target prokaryotes and have no effect on viruses.