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Biol 442 CMV and Viroids practice material
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Detailed practice questions and answers on Cytomegalovirus and Viroids for Biology 442.
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Quiz – Chapters CMV and Viroids1) All of the following describe a method of introducing Cucumber Mosaic Virus into a
healthy plant EXCEPT….
Grafting an infected branch
Insect feeding
Watering with a virus containing solution
Mechanical inoculation
Infection of seeds
2) Which of the following statements about cucumber mosaic virus is FALSE?
It has an enveloped helical nucleocapsid.
It is transmitted by aphids.
Its genome is composed of positive-strand RNA.
It can cause asymptomatic infections in some plants.
It has a wide range of host species that it can infect.
3) Which of the following describes the structures of the genomic RNA segments from
cucumber mosaic virus?
They have a 5’ cap and a 3’ terminal tRNA-like structure.
They have a protein covalently bound to the 5’ end and a 3’ poly A tail.
They have a 5’ IRES and a 3’ poly A tail.
, They have a 5’ cap and a 3’ poly A tail.
They have a 5’ phosphate and a 3’ terminal tRNA-like structure.
Question 0..5
4 points
Which of the following describes a feature of plant viruses, like cucumber mosaic virus, that
is rare or absent in animal viruses?
Viral particles are transmitted to new hosts via an insect vector.
Segmented genomes are each packaged into separate virions.
Viral genomic RNA has a 5’ cap.
Segmented genomes are each packaged into a single virion.
Viral genomes are composed of ssRNA with a negative sense.
Question 0..5
5 points
Which of the following characteristics of the cucumber mosaic virus influences the aphid
species that can transmit the virus?
The specificity of binding to the host cell receptor.
The replication efficiency of the RNA-dependent RNA polymerase.
Amino acid sequence of the coat protein.
The sequence of the 3’ end of the viral genomic RNA.
The sequence of the IRES at the 5’ end of the genomic RNA.
Question 0..5
6 points
Which of the following describes the first step in the replication cycle of the cucumber mosaic
virus?
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