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Mastering Microbiology multiple choice

Viruses lack all of the following EXCEPT:

nucleic acid.

Which of the following terms refers to a virus in the extracellular state?

virion

The first virus to be identified was isolated from a

plant

The capsid of a virus is made out of which of the following types of molecules?

protein

All of the following terms refer to viral shapes EXCEPT:

prion

Why do viruses have to infect host cells?

They are dependent on host cell organelles and enzymes for their replication.

The tail fibers of a bacteriophage are most useful during which of the following stages of the lytic replication cycle?

attachment

Which of the following is a major difference between a lysogenic and a lytic cycle in bacteriophages?

Viral DNA becomes a physical part of the bacterial chromosome only in a lysogenic cycle.

Which of the following viruses creates a DNA intermediary molecule from the information in their RNA genomes?

retroviruses

Which of the following types of viruses replicates in the cell's nucleus?

herpesviruses

Negative-sense ssRNA viruses require which of the following enzymes for their replication?

RNA-dependent RNA transcriptase

Bacteriophages can use all of the following structures for attachment to a bacterial cell EXCEPT:

the cytoplasmic membrane.

A naked virus is one without

an envelope

Each of the following features is common to BOTH bacteriophage AND animal virus infections EXCEPT:

uncoating

What is the advantage of lysogeny to lambda phage?

The phage persists for generations in the bacterial chromosome.

In the early 1900s, the virologist F. Peyton Rous discovered

cancer-causing viruses.

Fertilized chicken eggs are useful for the culture of viruses for all of the following reasons EXCEPT:

they allow bacteriophages to become latent.

HeLa cells are an example of a __________ cell culture.

continuous

Which of the following types of genetic material is normally found only in certain types of viruses and not in cells?

dsRNA

Scientists have determined that prion diseases are not caused by a type of slow virus because prions

contain no nucleic acid.

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