Chapter 4 Self-test questions

. Which of the following is the best description of the structure of a virus?

DNA with a fatty acid membrane.

RNA with a protein coat.

DNA or RNA with a protein coat.

DNA or RNA with a fatty acid membrane.

. Which plant virus has the broadest reported host range, including over 1200 plant species?

Tobacco mosaic virus.

Potato virus Y.

Tomato spotted wilt virus.

Cucumber mosaic virus.

. RNA based virus genomes have a high mutation rate. How does this affect them?

Virus populations can readily adapt to evolutionary pressures.

The viruses will die off due to high mutation rates.

Viruses are very small so they cannot be seen without an electron microscope.

Viruses are confined to a limited host range.

. Which of the following four statements about Tomato spotted wilt virus are correct?

TSWV is related to Hanta virus, a human infecting virus causing haemorrhagic fever

TSWV is transmitted by the thrips species Frankliniella occidentalis

TSWV can infect over 800 different plant species

TSWV is an example of a Tospovirus

. Sap inoculation is a type of testing also known as …?

Bioassay.

Enzyme-linked immunosorbent assay.

Polymerase chain reaction.

Genome sequencing.

. The vectors for Nepoviruses are…

Aphids.

Whitefly.

Mites.

Nematodes.

. Tobacco mosaic virus is an example of …

A DNA virus.

An aphid transmitted virus.

A contact transmitted virus.

A viroid.

. Which of the following is not a technique used for detection and diagnosis of plant viruses?

Real-time PCR.

ELISA.

Mass-spectrometry.

Electron microscopy.

. Maize Lethal Necrosis is a disease caused by infection with…

Maize chlorotic mottle virus.

Barley yellow dwarf virus.

Maize chlorotic mottle virus and Sugarcane mosaic virus.

Maize chlorotic mottle virus and Barley yellow dwarf.

. Which of these virus-vector pairs is incorrect?

Potato virus Y and aphids.

Arabis mosaic virus and nematodes.

Tomato spotted wilt virus and thrips.

Carrot red leaf virus and mites.

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